Demographic characteristics of exposed and control participants
| Studied variables | Exposed participants (n=52) | Control participants (n=50) | Test of significance | p value |
|---|---|---|---|---|
| *Student’s t test. | ||||
| †χ2 test. | ||||
| Age (y) | ||||
| Mean (SD) | 43.63 (5.51) | 42.48 (5.54) | 1.06* | 0.29 |
| Duration of work (y) | ||||
| Mean (SD) | 18.04 (8.29) | 17.08 (4.37) | 0.73* | 0.47 |
| Degree of education, n (%) | ||||
| University | 12 (23) | 8 (32) | 0.81† | 0.37 |
| Secondary | 40 (77) | 42 (68) | ||
| Body mass index (kg/m2) | ||||
| Mean (SD) | 27.62 (2.24) | 27.89 (2.58) | 0.58* | 0.57 |
| Smoking, n (%) | ||||
| Smokers | 18 (34.62) | 19 (38.00) | 0.13† | 0.72 |
| Non-smokers | 34 (65.38) | 31 (62.00) | ||
| Coffee/tea (cups/day) | ||||
| Mean (SD) | 5.33 (1.42) | 5.02 (1.22) | 1.17* | 0.25 |