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Characteristics of the subjects.
| Items (unit) | SPA (n = 64) | Control (n = 64) | P |
| Age, yr | 20.3 ± 1.2 | 19.8 ± 2.2 | >.05 |
| Sex (male) | 42 (53.8%) | 38 (48.7%) | >.05 |
| Years of education, yr | 13.3 ± 0.6 | 14.2 ± 0.3 | >.05 |
| Hours on internet per day, h/day | 8.6 ± 1.7 | 2.6 ± 0.4 | <.005 |
| Days on internet per week, days/wk | 6.2 ± 1.0 | 2.3 ± 0.7 | <.005 |
| Smart phone addition tendency scale (MPATS) | 64.4 ± 10.3 | 26.6 ± 3.2 | <.005 |
| Years using internet, yr | 6.0 ± 2.7 | 3.3 ± 1.9 | <.005 |
