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Table 3 Quartiles of study subjects in relation to birth outcomes and estimated iodine intake (as mean ± sd)

From: Estimated dietary iodine intake as a predictor of placental size: evidence from the ELSPAC study

Variable Estimated iodine intake [μg/day]  
Q1
(6.6; 79.7]
Q2
(79.7; 101.0]
Q3
(101.0; 127.5]
Q4
(127.5; 612.5]
P- value
Birth length [cm] 50.1 ± 2.3 50.2 ± 2.2 50.3 ± 2.3 50.1 ± 2.3 0.112
Birth weight [g] 3288 ± 470 3287 ± 470 3325 ± 493a 3263 ± 501a 0.035
Placental weight [g] 591 ± 168 595 ± 167a 587 ± 166 576 ± 163a 0.035
Cephalisation index [μm/g] 107.5 ± 20.1 107.1 ± 16.4 106.0 ± 16.8a 108.0 ± 17.3a 0.059
Ponderal index [kg/m3] 25.9 ± 2.2 25.9 ± 2.5 26.0 ± 2.3 25.8 ± 2.2 0.266
Birth weight/Placental weight [−] 5.9 ± 1.6 5.9 ± 1.6 6.0 ± 1.55 6.0 ± 1.6 0.083
  1. asignificant differences between means in post-hoc analysis using Tukey-Kramer method