Table 3.

The associations of factors of family context with excessive spending of time on computer use among adolescents

			Work with computer 2 hours and more
			Model 1	Model 2	Model3
		N (%)	OR (95% CI)		OR (95% CI)
Gender	Boys	289 (65.4)			1.62 (1.18-2.22)**
	Girls	216 (53.7)			1
Age (grade)	15-years old (9th grade)	341 (77.5)			3.91 (2.82-5.43)***
	11-years old (5th grade)	165 (40.6)			1
Family completeness	Incomplete	45 (66.2)	1.16 (0.66-2.05)
	Mixed	58 (58.6)	0.75 (0.47-1.21)
	Intact	392 (60.0)	1
Computer in bedroom	Yes	411 (67.2)	2.42 (1.73-3.39)***		2.25 (1.59-3.20)***
	No	94 (40.7)	1	a	1
Parents apply rules about spending time with a computer	Rarely-never	310 (69.8)	1.65 (1.19-2.28)*		1.50 (1.07-2.08)*
	Every day-almost every day	175 (49.4)	1	b, c	1
Parents apply rules about content of computer work	Rarely-never	355 (67.2)	1.27 (0.90-1.80)
	Every day-almost every day	124 (47.5)	1	d
Activities shared with parents	Lower score = more frequently shared activities		0.97 (0.82-1.15)	e

^athe interaction effect of the computer in the bedroom and age on the chance of excessive computer use was not significant.

^bthe interaction effect of parental rules about time spent with computer work and age on chance of excessive computer use was not significant.

^cthe interaction effect of parental rules about time spent with computer work and gender on chance of excessive computer use was not significant.

^dthe interaction effect of parental rules about content of computer work and age on chance of excessive computer use was not significant.

^ethe interaction effect of activities shared with parents and age on chance of excessive computer use was not significant.

Model 1 Each variable separated and adjusted to age and gender.

Model 2 Model 1 enriched by interaction. Each interaction entered separately.

Model 3 All variables included in one step.

**p < 0.05 **p < 0.01 ***p < 0.001.