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Table 5 Multivariable logistic regression analysis of VLBW and LBW with age for confounding factors (obesity, use of ART, smoking)

From: Impact of aging on obstetric outcomes: defining advanced maternal age in Barcelona

  n VLBW < 1500 (aOR 95% CI) n LBW < 2500 (aOR 95% CI)
Total (Inc)   159 (0.6%)   1311 (5.2%)
<  30 15 1 129 1
30–34 51 0.97 (0.48–1.94) 475 0.98 (0.78–1.22)
35–39 70 1.27 (0.64–2.50) 524 1.04 (0.83–1.30)
40–44 20 1.24 (0.56–2.78) 161 1.03 (0.78–1.34)
≥ 45 3 1.81 (0.45–7.23) 22 1.08 (0.64–1.83)
  1. aOR adjusted odds ratio. CI confidence interval. Inc. incidence. n number of newborns. Ref reference group. VLBW very low birth weight. LBW low birth weight