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Table 2 Pregnancy and birth outcomes for all participants and according to maternal iodine-to-creatinine ratio

From: Maternal iodine status, intrauterine growth, birth outcomes and congenital anomalies in a UK birth cohort

 Iodine-to-creatinine ratio (cohort split into thirds)
All participants, n = 6637Lower third (< 67 μg/g), n = 2213Middle third (67 to 105 μg/g), n = 2212Higher third (> 105 μg/g), n = 2212
Size at birth
 Birthweight centile, mean (SD)43.6 (28.5)42.0 (28.1)43.7 (28.9)45.2 (28.6)
 Birthweight (g), mean (SD)3245 (549)3217 (542)3247 (568)3271 (535)
 Small for gestational age (< 10th centile), n (%)880 (13)311 (14)298 (13)271 (12)
 Low birthweight (< 2.5 kg), n (%)466 (7)167 (8)161 (7)138 (6)
 Head circumference at birth (mm), mean (SD)343 (16)343 (15)343 (17)344 (15)
APGAR score (out of 10), median (IQR)
 1 min8.5 (1.4)8.5 (1.3)8.4 (1.4)8.5 (1.1)
 5 min9.0 (0.7)9.0 (0.7)9.0 (0.7)9.1 (0.7)
Ultrasound scan (34 weeks) estimations, mean (SD)
 Head circumference (mm)315 (9)314 (9)315 (9)315 (9)
 Biparietal diameter (mm)8.5 (0.3)8.5 (0.3)8.5 (0.3)8.5 (0.3)
 Femur length (mm)65 (2)65 (2)65 (2)65 (2)
 Abdominal circumference (mm)295 (14)294 (14)295 (14)296 (14)
 Estimated weight (g)2237 (237)2228 (244)2234 (228)2248 (240)
Preterm (< 37 weeks), n (%)354 (5)114 (5)134 (6)106 (5)
Stillbirth, n (%)37 (0.6)12 (0.5)14 (0.6)11 (0.5)
Congenital anomalies, n (%)
 All353 (5.3)123 (5.6)127 (5.7)103 (4.7)
 Nervous system125 (1.9)39 (1.8)44 (2.0)42 (1.9)