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Table 2 Pregnancy and birth outcomes (n = 78,318)

From: Insufficient maternal iodine intake is associated with subfecundity, reduced foetal growth, and adverse pregnancy outcomes in the Norwegian Mother, Father and Child Cohort Study

  Study samplea Median (IQR) 90% range
Time to pregnancy (months)b 56,416 1.5 (0.5, 6) 0.5–14
Gestational length (weeks) 77,995 40 (39, 41) 37–42
Birth weight (g) 78,210 3610 (3275, 3945) 2704–4460
Birth weight (z-score by gestational age and sex) 77,949 0.08 (− 0.54, 0.73) − 1.42–1.77
Placenta weight (g) 76,343 660 (580, 760) 450–940
Head circumference (cm) 76,693 35 (34, 36) 33–38
  Study samplea Number with outcome Percent with outcome
Subfecundity (> 12 months) b 56,416 6078 10.8 (10.0c)
Intrauterine death 78,318 270 0.34 (0c)
Preeclampsia 78,318 2936 3.8 (2.7c)
Preterm delivery (< GW 37) 77,995 3889 5.0 (2.9c)
Spontaneous preterm delivery (< 37 weeks) 77,940 2211 2.8 (2.2c)
Early preterm delivery (< 32 weeks) 77,995 612 0.78 (0.04c)
Small for gestational age (< 10 percentile) 77,949 7637 9.8 (8.2c)
Large for gestational age (> 90 percentile) 77,949 7539 9.7 (10.6c)
  1. aSmall differences in numbers are explained by missing data
  2. bOnly for planned pregnancies with available data on time to pregnancy (72%)
  3. cPrevalence in the subsample with UIC measurements (n = 2795)