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Table 2 Estimates of outcome measures among women aged 14 to 17 years compared with women aged 20 to 29 years

From: Preterm birth and reduced birthweight in first and second teenage pregnancies: a register-based cohort study

  First Births (n = 25780) Second births (n = 23072)
Outcomes Number of babies Crude estimatea (95% CI) Adjusted estimatea (95% CI) Number of babies Crude estimatea (95% CI) Adjusted estimatea (95% CI)
Birthweight in grams 3065 -51(-73, -29) -24(-40, -7)b 571 -158(-209, -107) -80(-115, -46)b
Birthweight in term babies 2847 -39(-59, -19) -27(-44, -11)b 512 -120(-166, -74) -88(-124, -52)b
SGA 147 0.88(0.73-1.05) 0.89(0.74-1.07)c 42 1.33(0.96-1.85) 1.23(0.88-1.71)c
VSGA 88 0.78(0.62-0.98) 0.79(0.63-0.99)c 32 1.49(1.03-2.16) 1.38(0.95-2.00)c
Preterm birth 33-36 weeks 151 1.23(1.03-1.48) 1.21(1.01-1.45)c 40 1.87(1.33-2.65) 1.93(1.38-2.69)c
Very preterm birth 23-32 weeks 65 1.45(1.07-1.95) 1.71(1.29-2.26)c 15 2.06(1.20-3.55) 1.87(1.10-3.18)c
  1. a The estimate of the effect of young maternal age on birthweight is birthweight mean difference in grams; the estimates of SGA, VSGA, preterm birth and very preterm birth are odds ratios.
  2. b adjusted for BMI, social deprivation score, infants sex, ethnicity and gestational age.
  3. c adjusted for BMI, social deprivation score, infants sex and ethnicity