| Variables | Frequency | Percentage (%) | ||
|---|---|---|---|---|
| Smartphone usage time (year) | 7.4±2.6 | |||
| Purpose of use | ||||
| Social network | 686 | 95.5 | ||
| Study | 677 | 94.3 | ||
| Entertainment | 671 | 93.5 | ||
| Basic calling, texting | 641 | 89.3 | ||
| Average smartphone usage in a day (hr) | ||||
| <5 hr | 156 | 21.7 | ||
| ≥5 hr | 562 | 78.3 | ||
| Use smartphone after waking up (yes) | 713 | 99.3 | ||
| Average use time after waking up | ||||
| ≤30 min | 536 | 89.6 | ||
| >30 min | 62 | 10.4 | ||
| Use smartphone before sleeping (yes) | 678 | 94.6 | ||
| Average time used before sleeping | ||||
| ≤30 min | 316 | 46.6 | ||
| >30 min | 362 | 53.4 | ||
| Variables | Frequency | Ratio (%) | CI 95% |
|---|---|---|---|
| Smartphone addiction | |||
| No | 378 | 52.6 | |
| Yes | 340 | 47.4 | 44–51 |