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