Table 1. Baseline Characteristics of Participants.
| No. (%) | |
| Age, y | |
| < 18 | 379 (14.7) |
| 18-25 | 403 (15.6) |
| 25-35 | 470 (18.2) |
| 35-45 | 443 (17.1) |
| 45-55 | 456 (17.6) |
| 55-65 | 277 (10.7) |
| > 65 | 156 (6) |
| Gender | |
| Male | 1 380 (53.3) |
| Female | 1 207 (46.7) |
| Married | 1 810 (70) |
| Race | |
| Fars | 631 (24.4) |
| Sistani and Baluchi | 1 861 (71.9) |
| Other | 95 (3.7) |
| Smoking | 97 (3.7) |
| Alcohol usage | 10 (0.4) |
| Education | |
| Less than 12 years | 1 943 (75.1) |
| More than 12 years | 644 (24.9) |
| Job | |
| Unemployed | 240 (9.3) |
| Worker | 111 (4.3) |
| Driver | 57 (2.2) |
| Student | 518 (20) |
| Other | 1 661 (64.2) |