TABLE 1.
Sociodemographic characteristics at baseline for the total sample and by experimental group.
| Total sample (n = 111) |
Omega-3 (n = 59) |
Placebo (n = 52) |
p | |
| Age—mean ± (SD) | 41.61 (9.76) | 41.02 (9.65) | 42.29 (9.93) | 0.50 |
| Monthly family income (US$)—n (%) | ||||
| No income | 22 (20) | 13 (22) | 9 (17) | 0.23 |
| Up to the minimum wage | 36 (32) | 16 (27) | 20 (38) | |
| 1–2 times the minimum wage | 22 (20) | 15 (25) | 7 (13) | |
| 2–3 times the minimum wage | 14 (13) | 7 (12) | 7 (13) | |
| 3–5 times the minimum wage | 11 (10) | 7 (12) | 4 (8) | |
| 5–10 times the minimum wage | 2 (2) | 0 (0) | 2 (4) | |
| 10–20 times the minimum wage | 2 (2) | 0 (0) | 2 (4) | |
| More than 20 times the minimum wage | 0 (0) | 0 (0) | 0 (0) | |
| Education level—n (%) | ||||
| No education | 0 (0) | 0 (0) | 0 (0) | 0.01* |
| Incomplete primary education | 35 (32) | 25 (42) | 10 (19) | |
| Complete primary education | 20 (18) | 6 (10) | 14 (27) | |
| Incomplete secondary education | 18 (16) | 8 (14) | 10 (19) | |
| Complete secondary education | 29 (26) | 18 (31) | 11 (21) | |
| Incomplete higher education | 6 (5) | 2 (3) | 4 (8) | |
| Complete higher education | 3 (3) | 0 (0) | 3 (6) | |
| Marital status—n (%) | ||||
| Married | 20 (18) | 6 (10) | 14 (27) | 0.04* |
| Widowed | 4 (4) | 2 (3) | 2 (4) | |
| Divorced | 15 (14) | 6 (10) | 9 (17) | |
| Single | 71 (64) | 44 (75) | 27 (52) | |
| Previous hospitalizations—n (%) | 53 (48) | 29 (49) | 24 (46) | 0.81 |
| Smoker—n (%) | 53 (48) | 29 (49) | 24 (46) | 0.40 |
*p < 0.05 in the comparisons between the placebo and omega-3 groups; the t-test was used for continuous variables, and the chi-squared test was used for categorical variables.