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Table 3 Risk of preterm birth strata by gestational age (weeks) according to maternal age (years) among singletons. Lombardy, Italy, 2007–2017

From: The role of maternal age on the risk of preterm birth among singletons and multiples: a retrospective cohort study in Lombardy, Northern Italy

 

Maternal age group

Overall

< 20

20–24

25–29

30–34

35–39

≥40

741,150

6580

40,806

143,333

272,934

240,326

37,171

32–36 w

 N (%)

36,365 (4.9)

359 (5.5)

1939 (4.8)

6287 (4.4)

12,336 (4.5)

12,821 (5.3)

2623 (7.1)

 OR

 

1.26 (1.13–1.41)

1.09 (1.03–1.15)

1.00

1.03 (1.00–1.06)

1.23 (1.19–1.27)

1.66 (1.59–1.74)

 aOR

 

1.16 (1.04–1.30)

1.03 (0.98–1.09)

1.00

1.08 (1.04–1.10)

1.27 (1.23–1.31)

1.62 (1.54–1.70)

< 32 w

 N (%)

5442 (0.7)

75 (1.1)

350 (0.9)

948 (0.7)

1767 (0.6)

1898 (0.8)

404 (1.1)

 OR

 

1.75 (1.38–2.22)

1.31 (1.15–1.48)

1.00

0.98 (0.91–1.06)

1.21 (1.12–1.31)

1.70 (1.51–1.91)

 aOR

 

1.50 (1.19–1.92)

1.18 (1.04–1.34)

1.00

1.06 (0.98–1.15)

1.30 (1.20–1.40)

1.66 (1.47–1.87)

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