Table 4.

CBCL scores at preschool age and markers of iodine status.

			Total problem score			Externalizing score			Internalizing score
	N	%	Mean	SD	p-Valuea	Mean	SD	p-Valuea	Mean	SD	p-Valuea
Pregnancy and neonatal period
Neonatal TSH level (mU/L)					0.152			0.051			0.266
<5	197	63.55	48.60	10.30		47.49	9.66		50.09	11.19
≥5	113	36.45	46.89	9.68		45.29	9.16		48.64	10.81
Vitamins during pregnancy					0.191			0.286			0.139
Containing iodine	51	43.59	47.43	9.29		46.02	8.67		48.73	10.76
No vitamins	66	56.41	49.89	10.41		47.98	10.51		51.73	10.63
Children characteristics
Urinary iodine concentration (μg/L)					0.086			0.116			0.098
<100	82	30.37	48.37	9.90		47.18	9.20		49.90	10.93
100–149	67	24.81	49.12	10.69		47.98	9.79		50.65	11.96
150–294	60	22.22	46.36	9.28		44.59	9.27		49.27	10.27
≥250	61	22.59	45.11	9.42		44.92	9.57		46.11	10.08
Household salt					0.189			0.092			0.356
Iodinised salt	96	34.53	47.39	9.77		46.42	9.63		48.82	10.91
Non-iodinised salt	170	61.15	47.63	10.11		45.99	9.31		49.40	11.05
No salt	12	4.32	53.00	13.64		52.25	11.89		53.75	14.72
Child dietary supplement intake					0.004			0.004			0.025
Yes	196	65.55	46.71	9.54		45.54	9.12		48.47	10.71
No	103	34.45	50.26	10.60		48.84	9.87		51.50	11.47

PsychoTSH study (N = 310), Belgium, 2008–2014.

A higher CBCL score is related to higher developmental problems.

^ap-Value from simple t-test or ANOVA.

*Significant with Bonferroni correction for multiple testing.

N, number of subject.

Statistically significant p-Values (p < 0.05) are highlighted in bold.