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. 2021 Sep 14;18(9):871–878. doi: 10.30773/pi.2021.0120

Table 2.

Differences in clinical variables according to phone use duration

Variables <6 hours (N=285) ≥6 hours (N=306) p-value <7 hours (N=399) ≥7 hours (N=192) p-value
Age, years 21.5±4.3 20.9±3.8 0.103 21.3±4.0 20.8±4.2 0.180
Sex (female) 217 (76.1) 263 (85.9) 0.003* 310 (77.7) 170 (88.5) 0.002*
How do you describe your average physical activity? 0.690 0.015*
 Light 148 (51.9) 168 (54.2) 197 (49.4) 117 (60.9)
 Moderate 121 (42.5) 127 (41.5) 178 (44.6) 70 (36.5)
 Vigorous 16 (5.6) 13 (4.2) 24 (6.0) 5 (2.6)
During this month, your food mainly constituted 0.003* 0.007*
 Healthy food 92 (32.3) 74 (24.2) 123 (30.8) 43 (22.4)
 Sometimes healthy food 155 (54.4) 161 (52.6) 215 (53.9) 101 (52.6)
 Unhealthy food 38 (13.3) 71 (23.2) 61 (15.3) 48 (25.0)
Overweight (BMI ≥25) 63 (22.3) 86 (28.1) 0.108 87 (21.9) 62 (32.3) 0.008*
Rating scales
 Patient Health Questionnaire-9 10.5±5.8 13.2±6.6 <0.001* 11.2±6.1 13.4±6.7 <0.001*
 Generalized Anxiety Disorder-7 9.1±5.4 11.4±6.6 <0.001* 9.8±5.9 11.3±6.0 0.003*
 Insomnia Severity Index 12.3±6.2 15.9±7.0 <0.001* 13.0±6.4 16.5±7.2 <0.001*
 Bedtime procrastination 30.2±6.7 32.3±6.5 <0.001* 30.4±6.5 33.1±6.7 <0.001*

Data are presented as mean±standard deviation or N (%).

*

statistically significant.

SD, standard deviation; BMI, body mass index