Summary of demographic variables. Unless otherwise specified, values are given as N (%)
| Variables | Total N (%) | Male N (%) | Female N (%) |
| Mean age (range), years | 45.5 (34 to 67) | 44.7 (34 to 67) | 46.8 (35 to 61) |
| Sex | 16 (100) | 6 (38) | 10 (62) |
| Marital status | |||
| Married | 8 (50) | 6 (100) | 2 (20) |
| Single | 4 (25) | 0 (0) | 4 (40) |
| Divorced | 3 (19) | 0 (0) | 3 (30) |
| Widowed | 1 (6) | 0 (0) | 1 (10) |
| Education | |||
| Elementary school or lower | 9 (56) | 3 (50) | 6 (60) |
| High school | 4 (25) | 2 (33) | 2 (20) |
| University studies | 3 (19) | 1 (17) | 2 (20) |
| Occupation | |||
| Employed | 5 (31) | 3 (50) | 2 (20) |
| Unemployed | 10 (63) | 3 (50) | 7 (70) |
| Retired | 1 (6) | 0 (0) | 1 (10) |
| Tobacco consumption | |||
| Non-smoker | 15 (94) | 6 (100) | 9 (90) |
| Former smoker | 1 (6) | 0 (0) | 1 (10) |
| Children | |||
| None | 4 (25) | 0 (0) | 4 (40) |
| One to two | 7 (44) | 2 (33) | 5 (50) |
| Three to four | 4 (25) | 3 (50) | 1 (10) |
| Seven | 1 (6) | 1 (17) | 0 (0) |