Perceived problems with computer gaming and internet use among adolescents: measurement tool for non-clinical survey studies

Abstract

Background

Existing instruments for measuring problematic computer and console gaming and internet use are often lengthy and often based on a pathological perspective. The objective was to develop and present a new and short non-clinical measurement tool for perceived problems related to computer use and gaming among adolescents and to study the association between screen time and perceived problems.

Methods

Cross-sectional school-survey of 11-, 13-, and 15-year old students in thirteen schools in the City of Aarhus, Denmark, participation rate 89%, n = 2100. The main exposure was time spend on weekdays on computer- and console-gaming and internet use for communication and surfing. The outcome measures were three indexes on perceived problems related to computer and console gaming and internet use.

Results

The three new indexes showed high face validity and acceptable internal consistency. Most schoolchildren with high screen time did not experience problems related to computer use. Still, there was a strong and graded association between time use and perceived problems related to computer gaming, console gaming (only boys) and internet use, odds ratios ranging from 6.90 to 10.23.

Conclusion

The three new measures of perceived problems related to computer and console gaming and internet use among adolescents are appropriate, reliable and valid for use in non-clinical surveys about young people’s everyday life and behaviour. These new measures do not assess Internet Gaming Disorder as it is listed in the DSM and therefore has no parity with DSM criteria. We found an increasing risk of perceived problems with increasing time spent with gaming and internet use. Nevertheless, most schoolchildren who spent much time with gaming and internet use did not experience problems.

Background

Computer gaming and internet use for communication and surfing is an important part of adolescents’ life [1]. Most adolescents in Europe and North America spend two or more hours daily on computer-games and two or more hours on surfing and chatting via the internet. Time use exceeding four hours per day is common (unpublished analyses of HBSC international data 2010) [2]. Studies of young people’s everyday life therefore need to address this behaviour and to examine whether it causes problems. A range of scholars have raised concerns about the risk of becoming addicted to these behaviours [3-9]. Many studies focus on negative side effects or co-occurrence with mental health problems [7,8,10-12], addictive behaviours [10-19], poor memory [20], poor school performance [21], poor cognitive function [20,22], withdrawal from social life [23], and neural damages [24-26]. According to Lortie & Guitton [27], there seems to be consensus on the existence of problematic behaviour but less consensus on whether or not it involved addiction. Most of the commonly applied questionnaires regarding internet addiction address core dimensions of addiction such as compulsive use, negative outcomes, and salience [27]. Insight into young people’s own perception about problems related to computer gaming and internet use may inform health education efforts to reduce such problems.

There is a debate whether excessive use of computer gaming and internet use is a disorder, a manifestation of an underlying psychopathology, a common behaviour, or whether it rather reflects a media-based moral panic [28-30]. It is important to conceptually separate non-problematic and problematic use of these media [19,29] and to distinguish engagement from pathology [29,31]. According to Ferguson et al. [29], a large part of the literature about computer gaming and internet use reflects a pathological conceptual model. This literature applies terms as addiction, dependency, disorder, and compulsiveness. Many studies apply measures, which are rooted in the DSM-V criteria for addiction and pathological gambling [3,15,25,32-34] or the ICD-10 criteria for dependency [9]. Other scholars adhere to what Ferguson et al. [29] labels the alternative model rather than a pathological model. These papers often examine motivation to engage in computer gaming and internet use and positive aspects of gaming and computer use, e.g. pain distraction [35], enhanced self-esteem or ego-clarity [1], the formation of social relations [36,37], stimulation of social skills [1], adherence to a cultural tendency [38,39], accessing updated information [6] and simply the fact that many young people are highly engaged in computer use [19,31,36]. The notion of high computer engagement is common in these papers [31,38]. These papers are often more concerned with screen time than pathology [5,34,40-42] and often focus on health issues such as physical inactivity [40], sedentary lifestyle, overweight [40,42], and sleep deprivation [20,43-45]. Especially, video-gaming seem to be difficult to categorise [46,47]. Several studies consider gaming and internet use as a continuum from computer engagement to addiction [47-49].

Most of the applied measures on computer gaming and internet use focus on negative side effects such as mental health problems. Most of these measures are long - typically more than 15 items. They are usually developed for clinical research and include items about the DSM-IV, DSM-V and ICD-10 criteria for internet addiction or compulsive computer gaming or pathological gambling [9,15,32-34,50-54]. Most of these measures include criteria for 1) withdrawal, 2) loss of control and 3) conflicts. According to King et al. [55] and Widyanto et al. [34] many instruments lack items about whether the individual believes that his/her gaming behaviour is problematic, and whether significant others consider that their gaming behaviour is problematic. We suggest that adolescents may perceive problems related to computer gaming and internet use which are non-pathological. Being engaged in school surveys about health and everyday life in adolescence, we feel there is a need for a measure which is short and simple for use in non-clinical research. This paper presents such a non-clinical measurement focusing on perceived problems related to computer use and gaming. It includes items about the individual’s and significant others’ perception of the behaviour being problematic.

Many papers have addressed screen time and the relationship between screen-time and perceived problems [31,48,55]. There seems to be a moderate correlation between screen-time and perceived problems but it is not clear how little screen-time may be sufficient to result in problems and how large screen-time may be unproblematic. The objectives of this paper is therefore 1) to present a new and short measurement tool for non-clinical research about perceived problems related to computer gaming and internet use and 2) to examine the relationship between screen time and these perceived problems.

Methods

Design and study population

The Aarhus School Survey was conducted in the city of Aarhus, the second largest city in Denmark (314,000 inhabitants). The overall aim was to investigate health, health behaviour, social relations and well-being of school. The survey is related to the cross-national Health Behaviour in School-aged Children (HBSC) study [2,56]. The sampling included 13 schools, strategically chosen to get a sufficient variation in socio-economic and migration background. All schoolchildren in grade five, seven, and nine (11-, 13- and 15-year-olds) were invited to complete a special version of the internationally standardized HBSC questionnaire [56]. The participation rate was 99% of the schoolchildren present on the day of data collection corresponding to 89% of the schoolchildren enrolled in the participating classes, n = 2.100.

Ethical issues

In Denmark there is no formal agency for approval of population based surveys and the schools decide autonomously whether to participate in such surveys. In each participating school, the school board, headmaster and schoolchildren’s council had approved the study and the school nurse had been informed. The school board is the parents’ representatives and they provided approval on behalf of the parents. The survey was conducted under full confidentiality, informed consent, and voluntary participation. The participants returned their questionnaire in sealed envelopes in order to protect their anonymity. There is no indication of name, date of birth, or school name in the data file, i.e. the data-file is totally anonymous.

Measurements

As most measures of problematic computer-, console- and internet use, we relied on self-reports of perceived problems [38,57-60]. We developed a first version of the questionnaire inspired by several scholars [34,55,60] who propose to focus on the student’s own perception of problems related to computer use, whether the family expresses concern, and whether the student feels bad in case of restricted access to computers. We tested this first version of the questionnaire among 44 schoolchildren in two age-groups (11- and 14-year-olds) and learned about the schoolchildren’ perceptions and experiences in focus group discussions immediately after they had answered the questionnaire. We identified three kinds of perceived problems: 1) whether the respondent perceived him/herself to be dependent on computer gaming and internet use; 2) whether the respondent felt in a bad mood if not able to use computer or access the internet; 3) whether the parents showed concerns about the adolescent’s use of computer/internet. The pilot test also showed that the schoolchildren distinguished between computer gaming, console-gaming, and use of the internet for communication and surfing (not for home work). This is the reason for asking separate questions for these three behaviours, although computer gaming and console-gaming are functionally similar behaviours.

Table 1 shows the final items and response categories. In the analyses, each variable was dichotomized into “Strongly agree” + “Partly agree” (coded 1) versus the remaining categories including missing values (coded 0). We constructed separate summary indexes for computer gaming, console-gaming and internet communication and surfing, range 0 to 3. We consider 0–1 as low and 2–3 as high problem score. We applied the HBSC items about the time use for computer- and console gaming and use of computer. Table 1 also shows the items and categorization of screen time. The distribution of screen time for gaming was so different for boys and girls that we decided to apply different cut-points for boys and girls.

Table 1.

Measurement of time use and perceived problems related to computer-gaming, console-gaming, and internet use

Item wording	Statements	Response keys
How much do you agree or disagree in the following statements on computer gaming?	1. I think I spend way too much time playing computer games	1. Strongly agree
		2. Partly agree
	2. I get in bad mood when I cannot spend time on computer games	3. Neither/nor
		4. Partly disagree
	3. My parents tell me, I spend way too much time on computer gaming	5. Strongly disagree
How much do you agree or disagree in the following statements on use of the Internet for surfing and chatting (not for homework)?	4. I think I spend way too much time on internet communication and surfing	1. Strongly agree
		2. Partly agree
	5. I get in bad mood when I cannot spend time on internet communication and surfing	3. Neither/nor
		4. Partly disagree
	6. My parents say, that I spend way too much time on internet communication and surfing	5. Strongly disagree
How much do you agree or disagree in the following statements on console-gaming (PlayStation, Xbox, GameCube etc)?	7. I think I spend way too much time on console-gaming	1. Strongly agree
		2. Partly agree
	8. I get in bad mood when I cannot spend time on console-gaming	3. Neither/nor
		4. Partly disagree
	9. My parents tell me, I spend way too much time on console-gaming	5. Strongly disagree
In your leisure time: about how many hours a day do you usually spend playing computer or console games (PlayStation, Xbox, GameCube etc.)?		1. None at all*)
		2. About ½ an hour a day,
		3. About 1 hour a day
		4. About 2 hours a day,
Responses were given separately for weekdays and weekends; we only use data about weekdays
		5. About 3 hours a day
		6. About 4 hours a day
		7. About 5 hours a day
		8. About 6 hours a day,
		9. About 7 hours or more a day
In your free time: about how many hours a day do you usually use a computer for chatting on the internet: internet surfing, e-mailing or doing homework?		1. None at all**)
		2. About ½ an hour a day,
		3. About 1 hour a day
		4. About 2 hours a day,
		5. About 3 hours a day
Responses were given separately for weekdays and weekends; we only use data about weekdays
		6. About 4 hours a day
		7. About 5 hours a day
		8. About 6 hours a day,
		9. About 7 hours or more a day

^*)Trichotomized for analytical purposes. Due to varying distributions by gender it was not possible to apply similar cut-points for girls and boys. To ensure sufficient power in all strata the following cut-points were applied: Girls: level 1 = 0 hours/day, level 2 = ½ hour/day, level 3 = 1 hour or more/day; Boys: level 1 = 0-½ hours/day, level 2 = 1 hour/day, level 3 = 2 hours or more/day. We use the label ‘high time use’ for level 3.

^**)level 1 = 0-½ hours/day, level 2 = 1 hour/day, level 3 (high time use) = 2 hours or more/day for both boys and girls.

Parents’ occupational social class was measured by the items: “Does your father/mother have a job? If yes, please say in what place he/she works. Please write exactly what job he/she does there”. The responses were coded in accordance with the HBSC coding recommendations which have many similarities with the Registrar General Social Class measure [61]. Each student was classified by the highest ranking parent into high (I-II), medium (III-IV) and low (V + economically inactive) family social class. We included ‘unclassifiable social class as a fourth and separate category in order to avoid losing too many observations in the analyses. Several validation studies have shown that children of the age of 11 and above can provide reliable and valid information about their parents’ occupation [62,63] although often with a high proportion of unclassifiable data. Family structure was based on schoolchildren’s reports on whom they lived with and categorised into 1) traditional family (two biological parents), 2) single parent family (one single biological parent) and 3) reconstructed family (one biological parent + one stepparent). Again, we kept missing as a separate category to avoid losing too many observations. Schoolchildren living in other family structures (n = 15) were left out of analyses. We used the schoolchildren’s reports about own and parents’ country of birth as a measure of migration status, categorised into children with Danish background, immigrants and descendants.

Statistical analyses

We used explorative factor analysis, Spearman correlation coefficients, and Cronbach’s coefficient alpha to assess the internal consistency (reliability) of the three indexes. We tested for differential item functioning (DIF) and observed that the indexes on problems related to computer gaming and problems related to console gaming functioned differently among boys and girls and differently in the three age groups. The index on problems related to internet use had DIF in relation to gender but not age group. Therefore, we conducted all analyses separately for boys and girls and checked all analyses for interaction with age group.

Associations between time spent on computer/console-gaming and score on index for problems related to computer gaming and problems related to console gaming, were estimated by multivariate logistic regression analyses in SAS version 9.1. Same analytical approach was applied to study the association between time spend on computer for communication, surfing or doing homework and score on problems related to internet use. All regression analyses were run as multilevel models by PROC GLIMMIX to account for the design effect caused by the cluster sampling. All analyses were adjusted by grade, family occupational social class, migration status, and family structure.

Results

For the three items forming the summary index on problems related to computer gaming, Cronbach’s coefficient alpha was 0.72. For the three items in the index on problems related to console-gaming alpha was 0.83 and for the three items in the index on problems related to internet communication and surf alpha was 0.76. Table 2 shows the inter-correlation between these variables. Correlations are moderate to high between items within the same index and low to moderate across the three indexes. The exploratory factor analysis with nfactors = 3 and varimax rotation showed the following variance explained by the three factors: 1.90, 1.59, and 1.37. The three factors within the same index had factor loadings > 0.60 with only one exception.

Table 2.

Inter-correlation ^* between the nine items ^**

Item	1	2	3	4	5	6	7	8	9
1. I think I spend way too much time playing computer games	1.00	0.37	0.63	0.30	0.09	0.23	0.40	0.24	0.30
2. I get in bad mood when I cannot spend time on computer games		1.00	0.47	0.16	0.40	0.25	0.26	0.49	0.31
3. My parents tell me, I spend way too much time on computer gaming			1.00	0.19	0.12	0.41	0.30	0.28	0.42
4. I think I spend way too much time on internet communication and surfing				1.00	0.46	0.57	0.19	0.15	0.15
5. I get in bad mood when I cannot spend time on internet communication and surfing					1.00	0.52	0.09	0.32	0.17
6. My parents say, that I spend way too much time on internet communication and surfing						1.00	0.16	0.24	0.29
7. I think I spend way too much time on console-gaming							1.00	0.57	0.68
8. I get in bad mood when I cannot spend time on console-gaming								1.00	0.63
9. My parents tell me, I spend way too much time on console-gaming									1.00

*Spearman correlation coefficients, all correlation coefficients are statistically significant, p < 0.0001.

**The inter-correlations between the three indexes were: computer gaming and console gaming index 0.33, computer gaming and internet use 0.28, and console gaming and internet use 0.19.

Table 3 presents time spent on computer and console gaming and internet communication and surf on weekdays. The proportion that used the computer or console for gaming three hours or more on weekdays was 31.5% among boys and 6.2% among girls (p < 0.0001). For both girls and boys, using three hours or more on the computer or console for gaming was most prevalent among seven graders (girls: p = 0.0001, boys: p = 0.0218). Among both boys and girls 17% used three hours or more on the internet for communication and surf. The proportion of both girls and boys who used three hours or more on the internet was increasing with increasing age (p < 0.0001). Table 3 also presents the distribution of included covariates.

Table 3.

Distribution of included variables

	Girls				Boys
	All girls n = 1069	5th grade n = 389	7th grade n = 397	9th grade n = 283	All boys n = 1031	5th grade n = 366	7th grade n = 378	9th grade n = 287
Gaming on computer or console: hours per weekday	%	%	%	%	%	%	%	%
0 hour	38.5	20.1	38.3	64.0	8.2	4.1	9.0	12.2
½ hour	26.9	37.8	23.4	16.6	15.1	17.2	14.6	13.2
1 hour	18.3	24.9	17.4	10.6	21.1	24.9	20.4	17.1
2 hours	8.2	10.0	9.8	3.5	21.5	23.5	21.2	19.5
3+ hours	6.2	5.7	8.3	3.9	31.5	26.2	33.6	35.5
Missing	2.0	1.5	2.8	1.4	2.6	4.1	1.3	2.4
Internet use: hours per weekday
0 hour	10.5	20.3	6.8	2.1	14.4	28.4	10.6	1.4
½ hour	24.0	33.7	20.4	15.6	27.2	32.5	25.9	22.0
1 hour	26.4	27.0	24.4	28.3	22.1	18.0	25.7	22.7
2 hours	20.0	11.8	24.4	25.1	16.0	11.2	15.9	22.3
3+ hours	17.0	5.4	20.7	27.9	17.8	6.6	20.6	28.6
Missing	2.2	1.8	3.3	1.1	2.5	3.3	1.3	3.1
Family social class
High	42.4	40.9	43.6	42.8	43.6	40.7	45.0	45.3
Middle	27.6	23.7	29.2	30.7	25.6	24.6	24.6	28.2
Low	16.2	16.2	15.4	17.3	12.7	11.2	13.8	13.2
Non-classifiable	12.3	18.0	10.1	7.4	16.1	21.9	13.8	11.9
Missing	1.6	1.3	1.8	1.8	2.0	1.6	2.9	1.4
Migration status
Natives	82.0	84.1	82.1	78.8	83.2	83.6	83.3	82.6
Migrants	5.1	4.1	6.1	5.0	5.3	4.6	4.8	7.0
Descendants	12.4	11.6	10.8	15.6	10.1	9.8	10.9	9.4
Missing	0.7	0.3	1.0	0.7	1.4	1.9	1.1	1.1
Family structure
Traditional	53.8	53.2	53.9	54.4	56.7	60.7	53.7	55.8
Single	20.2	19.3	21.9	19.1	20.0	16.9	20.1	23.7
Reconstructed	10.4	8.0	10.3	13.8	7.8	5.7	7.9	10.1
Other	0.9	1.0	0.8	1.2	0.5	0.6	0.3	0.7
Missing	14.7	18.5	13.1	11.7	15.0	16.1	18.0	9.8

Table 4 displays the proportion of participants who reported problems on each item and the distribution of participants on the three summary indexes. A score of 2 or 3 on the problems related to computer gaming index was more prevalent among boys (22%) than girls (7.8%) (p < 0.0001). Among boys, problems related to computer gaming was most prevalent in grade nine (p = 0.0295), among girls in grade five (p = 0.0342). Scoring 2 or 3 on the index on problems related to console-gaming was more prevalent among boys (7.7%) compared to girls (2.1%) (p < 0.0001). For both boys and girls the highest prevalence of problems related to console-gaming was observed among fifth grade schoolchildren (boys: p < 0.0001, girls: p < 0.0001). A score of 2 or 3 on the index on problems related to use of the internet for communication and surf was observed among more girls (13.4%) than boys (10.0%) (p = 0.0158). Among both boys and girls, problems related to use of the internet was most prevalent in grade nine (girls: p = 0.0003, boys: p = 0.0140).

Table 4.

Prevalence of perceived problems and the participants’ distribution on the three indexes

	Girls				Boys
	All girls n = 1069	5th grade n = 389	7th grade n = 397	9th grade n = 283	All boys n = 1031	5th grade n = 366	7th grade n = 378	9th grade n = 287
Computer gaming, % strongly + partly agree:	%	%	%	%	%	%	%	%
I think I spend way too much time playing computer games	13.5	19.8	12.6	6.0	25.9	24.6	24.9	28.9
I get in bad mood when I cannot spend time on computer games	5.6	6.7	5.3	4.6	11.4	11.5	10.8	12.2
My parents tell me, I spend way too much time on computer gaming	11.3	14.9	11.6	6.0	32.2	26.5	34.1	36.9
Index for problems related to computer gaming
0	79.1	71.2	79.9	88.7	56.4	59.3	55.8	53.3
1	13.2	18.8	12.3	6.7	21.6	22.1	22.8	19.5
2	6.1	7.5	6.3	3.9	18.1	15.3	17.2	23.0
3	1.7	2.6	1.5	0.7	3.9	3.3	4.2	4.2
Console-gaming, % strongly + partly agree:
I think I spend way too much time on console-gaming	3.7	6.9	2.3	1.4	10.0	11.2	9.8	8.7
I get in bad mood when I cannot spend time on console-gaming	2.4	3.3	2.0	1.8	6.5	7.4	5.0	7.3
My parents tell me, I spend way too much time on console-gaming	2.7	4.9	1.8	3.9	11.4	12.8	10.9	10.1
Index for problems related to console-gaming
0	94.4	90.5	96.0	97.5	82.3	80.9	82.3	84.0
1	3.5	5.9	2.5	1.4	10.0	9.8	11.4	8.4
2	1.0	1.5	1.0	0.4	5.4	6.3	4.8	5.2
3	1.1	2.1	0.5	0.7	2.3	3.0	1.6	2.4
Internet use, % strongly + partly agree:
I think I spend way too much time on internet communication and surfing	18.2	11.8	20.4	24.0	13.2	12.6	11.9	15.7
I get in bad mood when I cannot spend time on internet communication and surfing	13.8	7.2	16.4	19.1	8.3	4.9	9.3	11.5
My parents tell me, that I spend way too much time on internet communication and surfing	15.3	8.2	19.4	19.4	14.4	11.2	13.8	19.2
Index for problems related to Internet use
0	70.1	82.5	64.7	60.4	76.3	81.2	76.5	70.0
1	16.6	9.5	19.7	21.9	13.7	11.2	14.6	15.7
2	9.4	6.2	10.3	12.4	7.8	5.5	6.6	12.2
3	4.0	1.8	5.3	5.3	2.2	2.2	2.4	2.1

Table 5 presents the association between screen time and perceived problems. OR for problems related to computer gaming increased with time spend on gaming. OR for problems related to computer gaming was 9.51 (95% CI: 4.35-20.79) among girls and 6.90 (3.98-11.94) among boys with high screen time. We found no significant interactions with gender and age. Problems related to console-gaming increased by gaming time, OR = 10.23 (3.12-33.51) among boys with high time use. Despite the high odds ratios, even among schoolchildren with a high level of screen time only a minority reported high level of perceived problems i relation to gaming or internet use (Figure 1). Testing for gender and age interaction revealed a significant gender difference (p < 0.05). For both boys and girls the OR for problems related to use of internet for communication and surf increased with increased time spend on internet communication, surf and homework. The OR for perceived problems was 8.89 (4.72-16.75) among girls and 9.44 (4.72-18.88) among boys with high time use. We found no significant interactions with gender and age.

Table 5.

OR (95% CI) for perceived problems related to computer gaming, console-gaming, and internet use by time spend on computer/console-gaming and computer use for communication and surf ^*

	OR for problems related to computer gaming a
Time spend on weekdays on computer or console gaming b	Girls	Boys
	n = 1016	n = 967
Level 1 (lowest)	1.0	1.0
Level 2	2.45 (0.99-6.01)	1.74 (0.89-3.39)
Level 3	9.51 (4.35-20.79)	6.90 (3.98-11.94)
	OR for problems related to console gaming a
Time spend on weekdays on computer or console gaming b	Girls	Boys
	n = 1016	n = 967
Level 1 (lowest)	1.0	1.0
Level 2	1.49 (0.44-4.99)	4.61 (1.27-16.81)
Level 3	1.37 (0.43-4.42)	10.23 (3.12-33.51)
	OR for problems related to computer communication and surf a
Time spend on weekdays on computer communication and surf c	Girls	Boys
	n = 1014	n = 968
Level 1 (lowest)	1.0	1.0
Level 2	2.15 (1.04-4.41)	2.03 (0.86-4.79)
Level 3	8.89 (4.72-16.75)	9.44 (4.72-18.88)

*Analyses stratified by gender and adjusted by age group, family social class, migration status, and family structure.

^a Perceived problems related to computer/console-gaming and problems related to computer communication and surf is defined by scores of 2 or 3 on the summary indexes.

^b Girls: Level 1 = 0 hours/day, level 2 = ½ hour/day, level 3 = ≥ 1 hour/day.

Boys: Level1 = 0-½ hour/day, level 2 = 1 hour/day, level 3 = ≥ 2 hours/day.

^c Level 1 = 0-½ hour/day, level 2 = 1 hour/day, level 3 = ≥ 2 hours/day.

Figure 1.

Prevalence (%) of perceived problems related to computer-gaming, console-gaming, and internet use by screen time.

Discussion

This study presents a simple and straightforward measure of perceived problems related to computer gaming, console-gaming, and internet use for communication and surfing among adolescents. Like most other measures it is based on self-reported problems. Unlike most other measures it does not a priori consider excessive computer use and gaming as a disorder [29]. It is short and therefore appropriate for use in general health surveys and studies of adolescents’ everyday life and behaviour. The measure separates three kinds of computer use: computer gaming, console-gaming, and internet use for communication and surfing. The face validity of these items was high and the internal consistency acceptable. We also acknowledge the shortages of this new measure: It is not linked to the DSM-V criteria for addiction and pathological gambling or the ICD-10 criteria for dependency. Therefore, the measure is not sufficient to detect pathological gaming and computer use and probably not appropriate for clinical research. Some of the items function differently for boys and girls and we suggest separate analyses for boys and girls.

This study reveals clear gender differences in prevalence of perceived problems regarding computer, console, and internet use: Problems related to computer and console-gaming were most prevalent among boys where it occurred among every fifth and almost every tenth boy, respectively. This gender difference is in accordance with the studies by van Rooij et al. [40] and Desai et al. [10]. Casale & Fioavanti [64] found an opposite gender difference. Problems related to internet communication and surfing was most prevalent among girls where it was experienced by around 13%.

The prevalence of perceived problems showed interesting patterns across age. The youngest age groups seem to be most burdened by problems related to console-gaming and among girls also problems related to computer gaming. Among boys problems related to computer use was most prevalent among the older schoolchildren. These findings suggest that the three different kinds of screen and computer time may appeal differently to boys and girls in different age groups. Bonetti et al. [23] also finds that girls use more time online communicating with friends. The prevalence of perceived problems related to computer and console-gaming, and internet use for communication and surf increased with increasing screen time. Perceived problems occurred even among adolescents with a relatively low time use for gaming and internet use. Other studies on mental health side effects of gaming and internet use typically show problems among adolescents who use extremely many hours in front of their computer, e.g. more than five hours per day [54]. The available studies do agree that there is no linear and strong correlation between time use and problems related to gaming and computer use [31,40,48,54,55,65]. Our study also shows that even among participants who use more than three hours per day in front of their computer or console, the majority do not perceive problems.

Because of the cross-sectional design we cannot draw causal conclusions about the association between screen time and problems related to computer gaming and internet use. The participation rate was high and we do not anticipate substantial selection bias. If the 11% non-participants include a substantial proportion of schoolchildren with excessive screen time and high prevalence of perceived problems, then the study may have under-estimated the association between screen time and perceived problems.

The data collection reflects the year of data collection in which smartphones and tablet computers were rare. The applied HBSC measurement of time use does not completely reflect the measures of perceived problems because the measure of computer time use also includes time spend at the computer doing homework. Also, the measure of time spend on gaming both involve computer and console-gaming while problems related to computer gaming and problems related to console-gaming are measured by two distinct indexes. This information bias complicates the interpretation of the findings. Still, we think that the association between screen time and perceived problems is convincing. Another information bias that may complicate interpretation is the different cut-points for screen time among boys and girls. Unfortunately, the distribution of the screen time variable differed so much that it called for different cut-points among boys and girls. The measure of screen time is not comparable across gender on an absolute scale.

The study focuses on time use for computer and console gaming use and not the kind of gaming. The perception of problems related to gaming and internet use may differ by the content, i.e. that violent games and role-playing games may have different consequences [5]. Finally, unmeasured confounding may exist. Factors such as parental guidance and parental monitoring [9], psycho-pathology [66], and personality [16] may be potential confounders. Unfortunately, such data were not available in our study. We also missed data about the motivation to spend time for gaming and computer use.

We think there is a need for a brief and non-pathological measure, which we present in this paper. We propose to use this new measure to study how gaming and computer use behaviour is associated with other aspects of young people’s daily life [67,68], e.g. family structure, social relations, and health behaviours. It is important to test the validity, internal consistency and applicability in other study populations and other settings. We propose studies, which check the association between this new measure and potential side effects of gaming and internet use. We also suggest studies of why some young people perceive many problems in relation to computer gaming and internet use. Studies based on qualitative interviews may be appropriate to address this issue. It is important to identify groups of young people who are susceptible to problems if they spend much time by the computer or console screen and to develop appropriate ways to deal with the perceived problems. Finally, we need to know why some young people apparently spend excessive numbers of hours on gaming and internet use without experiencing any of the above problems.

Conclusion

The three new measures of perceived problems related to computer and console gaming and internet use among adolescents are appropriate, reliable and valid for use in non-clinical surveys about young people’s everyday life and behaviour. These new measures do not assess Internet Gaming Disorder as it is listed in the DSM and therefore has no parity with DSM criteria. We found an increasing risk of perceived problems with increasing time spent with gaming and internet use. Nevertheless, most schoolchildren who spent much time with gaming and internet use did not experience problems.

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

MR, KRM, TPP and BEH planned the entire study and were responsible for the data collection. All authors (PB, BEH, KRM, CRM, LN, TPP and MR) were involved in planning the paper and the statistical analyses. MR performed the analyses, TPP drafted the Results section. MR and BEH drafted the introduction, the Methods section and the Discussion. All authors (PB, BEH, KRM, CRM, LN, TPP and MR) contributed to the final revision of the manuscript. All authors read and approved the final manuscript.

Pre-publication history

The pre-publication history for this paper can be accessed here:

http://www.biomedcentral.com/1471-2458/14/361/prepub

Acknowledgements

We thank Poul Lundsgaard Bak, Henriette Hansen, Sheila Terp, and Anette Østergaard from the City of Aarhus for their important contribution to the planning of the study and data collection. We thank the Nordea Foundation and the The Danish Council for Independent Research (09–065450) for financial support to the study.