Table 2 The unadjusted association between baseline characteristics and uPOR

Age (y)

 ≤ 30

4103

Reference

 > 30

2874

1.22 (1.10 to 1.35)

0.0001

BMI (kg/m²)

 < 24

4928

Reference

 ≥ 24

2049

1.47 (1.32 to 1.63)

< 0.0001

AMH tertiles (ng/ml)

 T1 (< 2.94)

2321

Reference

 T2 (2.94–5.00)

2327

0.43 (0.38 to 0.48)

< 0.0001

 T3 (≥ 5.00)

2329

0.31 (0.27 to 0.35)

< 0.0001

AFC

 ≤ 16

3980

Reference

 > 16

2997

0.48 (0.43 to 0.53)

< 0.0001

BFSH tertiles (mIU/ml)

 T1 (< 5.55)

2314

Reference

 T2 (5.55–6.77)

2335

1.28 (1.13 to 1.46)

0.0001

 T3 (> 6.77)

2328

2.04 (1.80 to 2.31)

< 0.0001

Initial Gn dose (IU)

 < 150

3952

Reference

 ≥ 150

3024

1.56 (1.41 to 1.73)

< 0.0001

PCOS Diagnosis

 Non PCOS

5854

Reference

 PCOS

1123

0.73 (0.64 to 0.84)

< 0.0001