Table 1 Sociodemographic characteristics of the studied groups
| Â | Cases group N = 80 | Control group N = 80 | Test of significance |
|---|---|---|---|
Age/years | Â | Â | t = 1.44 |
 Mean ± SD | 35.88 ± 4.71 | 34.78 ± 4.93 | p = 0.151 |
Sex | |||
 Male | 50 (62.5%) | 52 (65%) | χ2 = 0.108 |
 Female | 30 (37.5%) | 28 (35%) | p = 0.74 |
Residence | |||
 Urban | 48 (60%) | 51 (63.7%) | χ2 = 0.0 |
 Rural | 32 (40%) | 29 (36.2%) | p = 1.0 |
Education | |||
 Primary | 13 (16.2%) | 9 (11.2%) | χ2 = 1.160 |
 Intermediate | 46 (57.5%) | 53 (77.5%) | p=0.281 |
 High | 21 (26.2%) | 18 (22.5%) |  |
Smoking | |||
 Never | 24 (30%) | 44 (55%) | χ2 = 11.08 |
 Former | 14 (17.5%) | 6 (7.5%) | p = 0.004* |
 Current | 42 (52.5%) | 30 (37.5%) |  |