Association between each socioeconomic indicator and female fertility impairment, stratified by the number of previous pregnancies
| Female fertility impairment | ||
|---|---|---|
| OR (95% CI) | ||
| Model 1* | Model 1+maternal education | |
| Primigravidae (n=2375) | ||
| Monthly income (€) | ||
| ≤1000 | 1 | 1 |
| 1001–2000 | 0.62 (0.43 to 0.89) | 0.93 (0.64 to 1.37) |
| >2000 | 0.47 (0.27 to 0.81) | 1.02 (0.54 to 1.91) |
| Not known/no answer | 0.60 (0.31 to 1.18) | 0.70 (0.36 to 1.38) |
| Occupation | ||
| Unskilled blue-collar | 1 | 1 |
| Skilled blue-collar | 0.93 (0.52 to 1.68) | 0.81 (0.44 to 1.47) |
| Lower level white-collar | 0.49 (0.30 to 0.80) | 0.69 (0.41 to 1.15) |
| Higher level white-collar | 0.32 (0.18 to 0.57) | 0.86 (0.41 to 1.79) |
| Model 2† | Model 2+maternal education | |
|---|---|---|
| Multigravidae (n=2582) | ||
| Monthly income (€) | ||
| ≤1000 | 1 | 1 |
| 1001–2000 | 1.11 (0.81 to 1.51) | 1.05 (0.75 to 1.46) |
| >2000 | 0.94 (0.61 to 1.44) | 0.97 (0.59 to 1.60) |
| Not known/no answer | 0.61 (0.33 to 1.12) | 0.59 (0.32 to 1.10) |
| Occupation | ||
| Unskilled blue-collar | 1 | 1 |
| Skilled blue-collar | 0.94 (0.58 to 1.53) | 0.94 (0.58 to 1.52) |
| Lower level white-collar | 1.08 (0.73 to 1.62) | 0.98 (0.64 to 1.49) |
| Higher level white-collar | 1.00 (0.63 to 1.61) | 1.08 (0.59 to 2.00) |
*Model 1, adjusted for maternal age, pregnancy planning, age at first sexual intercourse.
†Model 2, adjusted for maternal age, pregnancy planning, age at first sexual intercourse, body mass index.