Table 3 Odds ratios of pregnancy outcomes for different groups based on logistic models

 ≤ 18.0

231 (30.3)

Ref.

Ref.

Ref.

18.1 ~ 19.0

71 (9.3)

1.33 [0.67, 2.65]

1.23 [0.61, 2.46]

1.27 [0.59, 2.73]

19.1 ~ 20.0

98 (12.8)

2.57 [1.45, 4.56]

2.30 [1.29, 4.11]

2.45 [1.30, 4.61]

20.1 ~ 21.0

171 (22.4)

2.20 [1.17, 4.16]

2.18 [1.16, 4.13]

2.60 [1.31, 5.14]

21.1 ~ 22.0

54 (7.1)

2.39 [1.20, 4.76]

2.20 [1.10, 4.42]

2.00 [0.91, 4.37]

 > 22.0

138 (18.1)

1.23 [0.61, 2.47]

1.13 [0.56, 2.29]

1.09 [0.49, 2.43]