Table 4.

Distribution of psychomotor development scores (n = 386) in relation to infant UIC categories

		Psychomotor development scoresa (mean ± SD)
UIC categories (μg/L)	n	Combined psychomotor score	p	Eye‐hand coordination sub‐scale	p	Locomotor skills sub‐scale	p	Parent rating	p
<100	26	37.2 ± 8.5	0.974b	20.8 ± 4.2	0.928b	16.3 ± 4.9	0.987b	21.0 ± 2.5	0.770c
100–199	54	36.3 ± 5.3		20.1 ± 3.7		16.2 ± 2.4		20.3 ± 3.2
200–299	88	37.4 ± 6.2		20.7 ± 3.8		16.7 ± 3.3		20.4 ± 3.2
300–499	87	37.6 ± 5.9		21.1 ± 3.8		16.6 ± 3.2		20.1 ± 3.6
≥500	131	36.9 ± 6.9		20.5 ± 4.2		16.5 ± 3.6		20.5 ± 3.1

^aMaximum possible scores for psychomotor development are as follows: combined psychomotor score = 53; eye‐hand coordination sub‐scale = 27; locomotor skills subscale = 26; parent rating = 31; p value calculated by one‐way analysis of covariance, adjusting for hemoglobin concentrations and length‐for‐age Z‐score.

^bHemoglobin concentration is a significant predictor, p < 0.05 (Rothman, 2015).

^cLength‐for‐age Z‐score is a significant covariate, p < 0.05 (Rothman, 2015).

UIC = urinary iodine concentration; SD = standard deviation.