Table 1.
Characteristics of the study population, n = 511.
| Variables | n (%) | Mean 1 ± SD 2 |
|---|---|---|
| Education | ||
| Vocational | 18 (3.52) | |
| Secondary | 108 (21.14) | |
| Higher | 385 (75.34) | |
| Age [years] | 33.30 ± 3.69 | |
| 24–30 | 121 (23.68) | |
| 31–39 | 390 (76.32) | |
| BMI [kg/m2] | ||
| <18.5 | 29 (5.68) | |
| 18.5–24.9 | 301 (58.90) | |
| 25–29.9 | 154 (30.14) | |
| 30–40 | 27 (5.28) | |
| Current smoking | ||
| No | 471 (92.17) | |
| Yes | 40 (7.83) | |
| Initial infertility factor | ||
| Male factor | 193 (37.8) | |
| Idiopathic | 159 (31.1) | |
| Endometriosis | 70 (13.7) | |
| Ovarian factor | 24 (4.7) | |
| Tubal factor | 52 (10.2) | |
| Missing data | 13 (2.5) | |
| Duration of couple’s infertility [years] | ||
| 1–2 | 39 (7.63) | |
| 2–3 | 141 (27.59) | |
| 3–5 | 151 (29.55) | |
| >5 | 180 (35.23) | |
| Alcohol use | ||
| None or <1 drink/week | 281 (55.0) | |
| 1–3 drinks/week | 224 (44.0) | |
| Everyday | 6 (1) |
1 Mean: Arithmetic mean; 2 SD: Standard deviation.