Table 3 Crude and sequentially adjusted associations of maternal age with adverse pregnancy outcomes in all women (N = 8509) and among black women only (N = 4393)

 20–29 years (ref)

1.00

1.00

1.00

1.00

  < 20 years

1.11 (0.92–1.34)

0.93 (0.76–1.13)

1.12 (0.87–1.45)

0.88 (0.67–1.16)

 30–39 years

1.08 (0.95–1.21)

1.30 (1.14–1.49)

1.11 (0.94–1.32)

1.42 (1.18–1.71)

 40+ years

1.08 (0.81–1.44)

1.39 (1.03–1.88)

1.02 (0.70–1.47)

1.37 (0.93–2.02)

 20–29 years (ref)

1.00

1.00

1.00

1.00

  < 20 years

0.60 (0.50–0.72)

0.62 (0.51–0.74)

0.59 (0.46–0.75)

0.61 (0.47–0.79)

 30–39 years

1.77 (1.60–1.95)

1.68 (1.51–1.87)

1.68 (1.47–1.93)

1.64 (1.41–1.92)

 40+ years

2.84 (2.27–3.56)

2.58 (2.03–3.27)

2.52 (1.90–3.34)

2.42 (1.79–3.28)

 20–29 years (ref)

1.00

1.00

1.00

1.00

  < 20 years

1.14 (0.97–1.35)

0.92 (0.77–1.10)

1.17 (0.94–1.46)

0.91 (0.72–1.16)

 30–39 years

1.15 (1.04–1.28)

1.36 (1.21–1.53)

1.19 (1.03–1.37)

1.58 (1.34–1.87)

 40+ years

1.19 (0.93–1.53)

1.42 (1.09–1.85)

1.20 (0.88–1.62)

1.66 (1.19–2.32)