Table 2 Univariable and multivariable logistic regression analysis of variables potentially associated with sPTB in the subsequent pregnancy (n = 1643).

From: Optimal annual body mass index change for preventing spontaneous preterm birth in a subsequent pregnancy

  

Spontaneous PTB in the subsequent pregnancy

n/N (%)

cOR

95%CI

aOR

95%CI

Index pregnancy

Maternal age ≥ 35 years

13/305 (4.3)

1.5

(0.8–2.8)

1.4

(0.7–2.7)

Maternal age < 20 years

2/29 (6.9)

2.3

(0.5–10.0)

1.6

(0.3–9.2)

Pre-pregnancy BMI < 18.5 kg/m2

16/321 (5.0)

1.9*

(1.0–3.4)

1.7

(0.9–3.3)

Nulliparity

38/1313 (2.9)

0.7

(0.4–1.3)

0.7

(0.4–1.4)

Spontaneous PTB

16/66 (24.2)

13.7*

(7.1–26.3)

12.7*

(6.5–24.8)

Inter-pregnancy

Pregnancy interval, years

–

1.1

(0.9–1.5)

1.1

(0.8–1.5)

Anuual BMI change, kg/m2/year

–

0.7*

(0.5–0.9)

0.6*

(0.5–0.9)

  1. n/N: The number of sPTB events in the subsequent pregnancy/the number of patients for each variables; cOR, clude odds ratio; aOR, adjusted OR; CI, confidence interval; BMI, body mass index; PTB, preterm birth.
  2. *Statistically significant.
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