Table 1. Socio-demographic characteristics of the studied groups.
| Characteristics | RG (n = 100) | EE (n = 66) | OE (n = 87) |
|---|---|---|---|
| Sexa, ** | |||
| Female | 34 (34%) | 41 (62%) | 45 (51%) |
| Male | 66 (66%) | 25 (38%) | 42 (49%) |
| Age (years)b, *** | 33 [26–42] | 33 [29–38] | 38 [32–45] |
| Education (years of study) b, *** | 12 [10–13] | 12 [12–14] | 10 [8–12] |
| Smokera, ns | |||
| No | 69 (69%) | 43 (65%) | 55 (63%) |
| Yes | 31 (31%) | 23 (35%) | 32 (37%) |
| Alcohol intake (grams/day)b, ns | 1 [0–4] | 1 [0–4] | 0 [0–4] |
| Drugsa, ns | |||
| Never tried | 79 (79%) | 52 (79%) | 75 (86%) |
| Tried sometimes | 12 (12%) | 11 (17%) | 6 (7%) |
| Frequently used | 9 (9%) | 3 (5%) | 6 (7%) |
| Environmental exposure (years)c, ns | - | 20 [10–31] | 24 [12–39] |
| Working exposure (years) | - | - | 15 [9–22] |
RG = reference group EE = environmentally exposed group, OE = occupationally exposed group. Continuous variables are expressed as median and the interquartile range. Categorical variables are expressed as frequencies and percentage.
aChi-squared test;
bKruskal-Wallis H-test;
cMann-Whitney U-test.
**: p<0.01,
***: p<0.001,
ns: not significant.