Table 1.

Characteristics of the study participants.

Characteristics	Number (%)
Gender	Male = 193 (49.9%) Female = 194 (50.1%)
Smoking status	Smoker =324 (83.7%) Non-smoker = 63 (16.3%)
Age (years)	34 (24–43) *
Level of education	Middle school 6 (1.6%) High school 85 (22%) Bachelor’s degree 249 (64.3%) Postgraduate degree 47 (12.1%)
Region of residence	Madinah 200 (51.7%) Makkah 94 (24.3%) Riyadh 30 (7.8%) Eastern Province 30 (7.8%) Qassim 29 (7.5%) Al-Baha 1 (0.3%) Jazan 1 (0.3%) Northern borders 2 (0.5%)
Nature of workplace	Educational establishment (student/staff) 192 (49.6%) Healthcare facility (Physician/nurse) 39 (9.8%) Nonmedical establishment (admin/clerk) 60 (15.5%) Field work (Engineer/technician) 21 (5.4%) Home (Housewife/retiree/jobseeker) 76 (19.6%)

* Age is described in median years (interquartile range).