Table 1. Sample characteristics.
| No (%) | |
| Age (year; Mean, SD) | 15.44 (0.687) |
| Birth place | |
| Tehran | 301 (74.9) |
| Other | 101 (25.1) |
| Duration of Residence in Tehran (year; Mean, SD) | 14.27 (2.85) |
| Number of Family members | |
| ≤3 | 36 (9) |
| 4 | 154 (38.3) |
| 5≥ | 212 (52.7) |
| Living with... | |
| Parents | 380 (94.5) |
| One parent | 19 (4.7) |
| Relatives | 3 (0.7) |
| Having siblings | |
| Yes | 376 (93.5) |
| No | 26 (6.5) |
| Father’s job | |
| unemployed | 14 (3.5) |
| officer | 73 (18.2) |
| worker | 74 (18.4) |
| other | 241 (60) |
| Mother’s job | |
| housekeeper | 386 (96) |
| officer | 10 (2.5) |
| worker | 6 (1.5) |
| Father’s education | |
| Higher | 32 (8) |
| Secondary | 219 (54.5) |
| Primary | 151 (37.6) |
| Mother’s education | |
| Higher | 17 (4.2) |
| Secondary | 223 (55.5) |
| Primary | 162 (40.3) |
| Past semester grade point average (0-20; Mean, SD) | 14.91 (2.41) |
| Housing type | |
| Landlord | 246 (61.2) |
| Tenant | 145 (36.1) |
| Other | 11 (2.7) |