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Table 3 Estimates of outcome measures among women aged 18 to 19 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 = 28026) Second births (n = 24691)
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 5316 -40(-57, -23) -29(-42, -16)b 2910 -78(-103, -53) -55(-74, -37)b
Birthweight in term babies 4969 -33(-49, -16) -30(-43, -16)b 2044 -71(-95, -48) -57(-77, -38)b
SGA 325 1.13(0.99-1.28) 1.13(0.99-1.28)c 165 1.35(1.13-1.60) 1.25(1.05-1.48)c
VSGA 212 1.09(0.94-1.28) 1.09(0.93-1.27)c 107 1.27(1.03-1.06) 1.17(0.94-1.45)c
Preterm birth 33-36 weeks 240 1.07(0.92-1.25) 1.10(0.95-1.28)c 106 1.43(1.16-1.76) 1.27(1.03-1.59)c
Very preterm birth 23-32 weeks 94 1.45(1.14-1.84) 1.42(1.12-1.81)c 38 1.22(0.84-1.76) 1.21(0.86-1.71)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