Table 1. Demographic and Clinical Profiles of Adults with and without Internet Addiction in a Nationwide Community Sample of Korea (n = 3212).
| Profiles | Internet addiction (n = 204) | No internet addiction (n = 3008) | Statistics t or χ2 p-value | |||
|---|---|---|---|---|---|---|
| Internet Addiction Test (IAT, mean, SD) | 58.95 | (9.27) | 25.90 | (7.02) | 50.0 | < 0.0001 |
| Age (mean, SD) | 26.9 | (8.8) | 35.0 | (9.9) | 12.6 | < 0.0001 |
| Female gender (%) | 84 | 41.2% | 1702 | 56.6% | 18.4 | < 0.0001 |
| Marital status (%) | ||||||
| Married | 44 | 21.6% | 1876 | 62.6% | 151.0 | < 0.0001 |
| Divorced/widowed/separated | 6 | 2.9% | 133 | 4.4% | ||
| Unmarried | 154 | 75.5% | 990 | 33.0% | ||
| Education years (mean, SD) | 13.8 | (2.6) | 13.8 | (2.6) | 0.27 | 0.79 |
| Education years (%) | ||||||
| No education | 2 | 1.0% | 6 | 0.2% | 14.99 | 0.005 |
| 1–6 | 1 | 0.5% | 51 | 1.7% | ||
| 7–9 | 4 | 2.0% | 90 | 3.0% | ||
| 10–12 | 54 | 26.5% | 1067 | 35.5% | ||
| 12+ | 143 | 70.1% | 1794 | 59.6% | ||
| Occupation (%) | ||||||
| Full time | 55 | 27.0% | 1452 | 48.3% | 40.0 | < 0.0001 |
| Part time | 6 | 2.9% | 134 | 4.5% | ||
| Unemployed | 143 | 70.1% | 1421 | 47.3% | ||
| Monthly income (%) | ||||||
| < 2000$ | 50 | 34.7% | 850 | 33.1% | 0.26 | 0.88 |
| 2000–3000$ | 45 | 31.3% | 792 | 30.9% | ||
| ≥ 3000$ | 49 | 34.0% | 923 | 36.0% | ||
| Duration of sleep (mean, SD) | ||||||
| Weekdays (hrs) | 7.10 | (1.65) | 6.91 | (1.31) | 1.63 | 0.10 |
| Weekends and holidays (hrs) | 7.94 | (1.75) | 7.84 | (1.64) | 0.90 | 0.37 |
| Suicidea | ||||||
| Suicide ideation | 45 | 22.4% | 452 | 15.1% | 7.56 | 0.006 |
| Suicide plan | 14 | 7.0% | 79 | 2.6% | 12.4 | < 0.0001 |
| Suicide attempt | 11 | 5.5% | 82 | 2.7% | 5.09 | 0.024 |
SD, standard deviation. Internet addiction was defined as a score of more than 50 on the Young’s Internet Addiction Scale.