Table3 Adjusted ORs (95% CI) for the association between GWG and different groups of 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

Moderately preterm birth

Very preterm birth

Extremely preterm birth

OR

Moderately preterm birth

Very preterm birth

Extremely preterm birth

Overall

1.79 (1.33–2.42) *

2.10 (1.09–4.05) *

3.10 (1.32–7.28) *

Ref

0.88 (0.78–0.99) *

0.49 (0.30–0.82) *

/

Age groupsa

< 20

13.18 (0.11–1562)

/

2.95 (0.03–315)

Ref

/

/

/

20–29

1.65 (1.07–2.54) *

3.10 (1.13–8.51) *

1.39 (0.31–6.31)

Ref

0.75 (0.63–0.91) *

0.59 (0.34–1.05)

/

30–34

1.93 (1.06–3.52) *

3.03 (0.91–10.07)

15.98 (1.60–159) *

Ref

0.92 (0.74–1.15)

/

/

\(\gg \) 35

2.06 (1.08–3.93) *

0.77 (0.14–4.23)

2.67 (0.30–24.18)

Ref

1.17 (0.91–1.49)

/

/

Pre-pregnancy BMIb

Underweight

1.80 (0.73–4.43)

6.78 (0.56–81.82)

6.27 (0.37–107.44)

Ref

1.16 (0.82–1.66)

/

/

Normal

1.73 (1.24–2.42) *

2.44 (1.16–5.16) *

4.18 (1.48–11.82) *

Ref

0.84 (0.72–0.97) *

0.16 (0.00–6.33)

0.18 (0.00–14.6)

Overweight and obese

2.98 (0.93–9.52)

/

/

Ref

0.91 (0.68–1.21)

0.67 (0.40–1.12)

0.54 (0.26–1.12)

  1. 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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