From: Outdoor air pollution and diminished ovarian reserve among infertile Korean women
 | Total population (n=2276) | Seoul residents (n=1122) | Non-Seoul residents (n=1154) | P for differenceb |
---|---|---|---|---|
Age (year) | 36.6 ± 4.2 | 36.2 ± 4.1 | 37.0 ± 4.3 | < 0.001 |
BMI (kg/m2) | 21.7 ± 3.1 | 21.4 ± 3.0 | 22.1 ± 3.3 | 0.826 |
 < 18.5 | 243 (10.7%) | 129 (11.5%) | 114 (9.9%) | < 0.001 |
 18.5–23 | 1431 (62.8%) | 746 (66.5%) | 685 (59.4%) | |
 23–25 | 300 (13.2%) | 128 (11.4%) | 172 (14.9%) | |
 ≥ 25 | 302 (13.3%) | 119 (10.6%) | 183 (15.8%) | |
Timing of blood test | ||||
 Mar–May | 750 (33.0%) | 358 (31.9%) | 392 (34.0%) | 0.622 |
 June–Aug | 489 (21.5%) | 252 (22.5%) | 237 (20.5%) | |
 Sept–Nov | 337 (14.8%) | 171 (15.2%) | 166 (14.4%) | |
 Dec–Feb | 700 (30.8%) | 341 (30.4%) | 359 (31.1%) | |
Smoking history | 51 (2.2%) | 28 (2.5%) | 23 (2.0%) | 0.584 |
Currently working | 1431 (62.9%) | 783 (69.8%) | 648 (56.2%) | < 0.001 |
AMH (ng/mL) | 3.3 ± 3.1 | 3.5 ± 3.2 | 3.1 ± 3.0 | 0.001 |
AMH ratioa | 0.8 ± 0.7 | 0.8 ± 0.7 | 0.8 ± 0.7 | 0.055 |
Low AMH (< 0.5 ng/mL) | 235 (10.3%) | 81 (8.6%) | 154 (13.3%) | 0.025 |