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Table 1 Demographic and clinical characteristics and anti-Müllerian hormone (AMH) of the study population, total population (n=2,276), Seoul (n=1,122), and non-Seoul (n=1,154) residents

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

  1. BMI body mass index, AMH anti-Müllerian hormone
  2. aRatio of observed AMH to age-specific AMH. Age-specific AMH was calculated from a quadratic model (logAMH = −1.442 + 0.225 × age − 0.004 × age2) [30]
  3. bP values for difference between Seoul residents and non-Seoul residents. Wilcoxon rank sum test and chi-square test were used for comparison
  4. Due to missing information, sum of columns may not equal to the number of total population