Participants’ characteristics
| Characteristics | KSA sample (n=111) n (%) | USA sample (n=115) n (%) |
| Age mean (SD), in years | 32.0 (10.6) | 36.6 (11.9) |
| Sex | ||
| Female | 46 (41.4) | 54 (47.0) |
| Male | 65 (58.6) | 61 (53.0) |
| Education | ||
| Beyond high school | 93 (83.8) | 89 (77.4) |
| High school or less | 19 (16.2) | 26 (22.6) |
| Smoking status | ||
| Non-smokers | 58 (52.3) | 70 (60.9) |
| Smokers | 53 (47.7) | 45 (39.1) |
KSA, Kingdom of Saudi Arabia.