Table 2 ORs for the association between GWG and preterm birth.

From: Association between maternal gestational weight gain and preterm birth according to body mass index and maternal age in Quzhou, China

 

Low GWG

Adequate GWG

Excess GWG

n1/n2

Crude OR (95% CI)

Adjusted OR (95% CI)

n1/n2

OR (95% CI)

n1/n2

Crude OR (95% CI)

Adjusted OR (95% CI)

Overall

114/851

1.77 (1.37–2.29)*

1.92 (1.47–2.50) *

150/1985

Ref

51/1123

0.60 (0.43–0.83)*

0.81 (0.72–0.91) *

Age groupsa

< 20

4/9

1.44 (0.28–7.34)

4.16 (0.29–59.91)

4/13

Ref

0/17

/

/

20–29

49/431

1.62 (1.11–2.36)*

1.76 (1.20–2.59) *

76/1085

Ref

20/668

0.43 (0.26–0.71) *

0.72 (0.60–0.86) *

30–34

34/249

2.11 (1.30–3.43)*

2.44 (1.45–4.12) *

38/588

Ref

17/292

0.90 (0.50–1.62)

0.87 (0.70–1.08)

\(\gg \) 35

27/162

1.56 (0.90–2.69)

1.79 (1.00–3.12) *

32/299

Ref

14/146

0.90 (0.46–1.73)

1.01 (0.80–1.28)

Pre-pregnancy BMIb

Underweight

15/175

2.19 (1.03–4.63)*

2.26 (1.03–4.96) *

14/357

Ref

6/128

1.20 (0.45–3.18)

1.11 (0.78–1.57)

Normal

93/646

1.84 (1.38–2.45)*

1.94 (1.44–2.62) *

117/1492

Ref

28/757

0.47 (0.31–0.72)*

0.78 (0.68–0.90) *

Overweight and obese

6/30

1.43 (0.53–3.89)

1.46 (0.51–4.21)

19/136

Ref

17/238

0.51 (0.26–1.02)

0.77 (0.60–0.99) *

  1. n1/n2 means number of preterm/term births. Adjusted for maternal delivery age, education level, parity, gravidity, pre-pregnancy BMI, previous premature delivery, mode of conception, prenatal care, timing of initiation of prenatal care, pregnancy-induced hypertension, gestational diabetes mellitus and sex of infant.
  2. OR odds ratio, CI confidence interval, Ref reference.
  3. *p < 0.05.
  4. aMaternal delivery age was not included in this model.
  5. bPre-pregnancy BMI was not included in this model.
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