Table 2. Socio-demographic characteristics and SAS-SV scores.
| (N = 540) | ||||
| Variables | N (%) | SAS-SV | p | |
| Mean±SD | Mean±SD | |||
| Age | 14.46±0.54 | |||
| Sex | Boy | 343(63.5) | 23.75±10.26 | <.001 |
| Girl | 197(36.5) | 27.89±11.17 | ||
| Socio-economic state | Low | 86(24.0) | 25.08±10.65 | .828 |
| Medium | 191(53.2) | 25.90±11.10 | ||
| High | 82(22.8) | 25.94±11.12 | ||
| Family | Parents | 442(81.9) | 25.53±11.03 | .173 |
| Single-parent | 69(12.8) | 23.07±9.62 | ||
| No-Parent | 23(4.3) | 26.70±9.61 | ||
| Alcohol | Yes | 21(4.1) | 27.52±9.98 | .295 |
| No | 496(95.9) | 25.03±10.69 | ||
| Smoking | Yes | 22(4.2) | 27.94±10.91 | .210 |
| No | 496(95.8) | 25.03±10.61 | ||
| Time of smartphone use | Weekday | 3.03±3.09 | ||
| Weekend | 4.07±4.08 | |||
| Purpose of smartphone use | Messenger and SNS | 300(55.6) | 26.29±11.07 | .077 |
| Entertainment | 114(21.1) | 23.42±10.03 | ||
| Web surfing | 43(8.0) | 24.79±9.88 | ||
| Etc. | 83(15.4) | 24.29±10.86 | ||
| Self evaluation of smartphone addiction | Non-addiction | 312(57.8) | 21.82±8.34a | <.001 |
| Addiction | 134(24.8) | 34.02±10.34ab | ||
| Don't know | 94(17.4) | 24.17±11.68b |
a, b : Scheffé test (the means with the same letter were significantly different).