Table 1.
General characteristics of subfertile women (cases) and controls
| Characteristics | Cases (n = 104) | Controls (n = 208) | p |
|---|---|---|---|
| Woman’s age (years) | 33.4 ± 3.5 | 33.4 ± 3.5 | 0.92 |
| BMI (kg/m2) | 22.1 ± 3.3 | 21.9 ± 3.7 | 0.60 |
| White blood cell (109/L) | 7.91 ± 3.64 | 7.66 ± 3.53 | 0.64 |
| Neutrophil (109/L) | 5.22 ± 3.42 | 4.70 ± 3.10 | 0.31 |
| Lymphocyte (109/L) | 1.80 ± 0.41 | 1.89 ± 0.51 | 0.24 |
| Platelets (109/L) | 205 ± 52 | 211 ± 58 | 0.49 |
| Ethnicity | 0.19 | ||
| Caucasian | 98 (94%) | 203 (98%) | |
| Other | 6 (6%) | 5 (2%) | |
| Marital status | 0.51 | ||
| Married | 77 (74%) | 145 (70%) | |
| Unmarried | 27 (26%) | 63 (30%) | |
| Scholarity | 0.07 | ||
| Elementary–middle school | 14 (14%) | 15 (7%) | |
| High school | 43 (41%) | 74 (36%) | |
| College/university | 47 (45%) | 119 (57%) | |
| Previous pregnancies | 49 (47%) | 117 (56%) | 0.15 |
| Previous live births | 25 (24%) | 83 (40%) | 0.006 |
| Previous ectopic pregnancies | 0 (0%) | 3 (1%) | 0.55 |
| Previous ovarian surgery | 8 (8%) | 6 (3%) | 0.08 |
| Menstrual cycle length (days) | 28.6 ± 2.4 | 28.7 ± 2.2 | 0.55 |
| Recent shortening of the menstrual cycle | 6 (5%) | 7 (3%) | 0.37 |
| Smoking | 16 (15%) | 36 (17%) | 0.11 |
| Alcohol habits | 0.71 | ||
| Never | 71 (68%) | 134 (64%) | |
| Occasional | 20 (19%) | 41 (20%) | |
| Regular | 13 (13%) | 33 (16%) | |
| Twin pregnancy | 1 (1%) | 2 (1%) | 0.78 |
| Neonatal gender | 0.90 | ||
| Male | 56 (54%) | 114 (55%) | |
| Female | 47 (46%) | 92 (45%) |
Data is presented as mean ±SD or n (%) as appropriate
BMI body mass index
aRefers only to singletons