Table 1.
Characteristics of participants included in the analysis
| All | Regular | Irregular | P | |
|---|---|---|---|---|
| (N = 114) | (N = 89) | (N = 25) | ||
| No. (%) | No. (%) | No. (%) | ||
| Age, median (IQR a), years | 31.00 (26.00, 34.00) | 32.00 (27.00, 35.00) | 28.00 (25.00, 31.00) | 0.005 |
| Age groups, years | 0.017 | |||
| 18–24 | 14 (12.3) | 8 (9.0) | 6 (24.0) | |
| 25–30 | 37 (32.5) | 25 (28.1) | 12 (48.0) | |
| 31–35 | 43 (37.7) | 38 (42.7) | 5 (20.0) | |
| 36–45 | 20 (17.5) | 18 (20.2) | 2 (8.0) | |
| BMI b, median (IQR a), kg/m2 | 20.73 (19.30, 22.67) | 20.82 (19.33, 22.59) | 20.70 (19.29, 23.51) | 0.88 |
| BMI groups | 0.294 | |||
| < 18.5 | 12 (10.5) | 8 (9.0) | 4 (16.0) | |
| 18.5–23.9 | 86 (75.4) | 70 (78.7) | 16 (64.0) | |
| ≥ 24 | 16 (14.0) | 11 (12.4) | 5 (20.0) | |
| Marital status | 0.42 | |||
| Married | 54 (47.4) | 45 (50.6) | 9 (36.0) | |
| Single | 59 (51.8) | 43 (48.3) | 16 (64.0) | |
| Divorced | 1 (0.9) | 1 (1.1) | 0 (0.0) | |
| Educational attainment | 0.599 | |||
| High school | 4 (3.5) | 4 (4.5) | 0 (0.0) | |
| College | 52 (45.6) | 39 (43.8) | 13 (52.0) | |
| Master’s or above | 58 (50.9) | 46 (51.7) | 12 (48.0) | |
| Occupation | 0.069 | |||
| Unemployed | 29 (25.4) | 20 (22.5) | 9 (36.0) | |
| Full-time worker | 84 (73.7) | 69 (77.5) | 15 (60.0) | |
| Part-time worker | 1 (0.9) | 0 (0.0) | 1 (4.0) | |
| Duration of menstruation, median (IQR a), days | 6.00 (5.00, 7.00) | 6.00 (5.00, 7.00) | 6.00 (5.00, 7.00) | 0.319 |
| Menarche, median (IQR a), years | 13.00 (12.00, 14.00) | 13.00 (12.00, 14.00) | 13.00 (12.00, 14.00) | 0.699 |
| Smokers | 3 (2.6) | 3 (3.4) | 0 (0.0) | 1 |
| Consume alcohol | 27 (23.7) | 24 (27.0) | 3 (12.0) | 0.197 |
| Previous pregnancy | 49 (43.0) | 43 (48.3) | 6 (24.0) | 0.052 |
| Previous childbirth | 49 (43.0) | 43 (48.3) | 6 (24.0) | 0.052 |
| AMH c, median (IQR a), ng/ml | 3.90 (2.13, 5.61) | 3.53 (2.09, 5.25) | 4.84 (3.24, 7.73) | 0.062 |
| AMH c groups | 0.035 | |||
| < 0.7 | 7 (6.1) | 4 (4.5) | 3 (12.0) | |
| 0.7–7.5 | 89 (78.1) | 74 (83.1) | 15 (60.0) | |
| > 7.5 | 18 (15.8) | 11 (12.4) | 7 (28.0) |
aIQR, interquartile range
bBMI, body mass index
cAMH, Anti-Müllerian hormone