Table 1

Descriptive and demographic characteristics of the studied population according to gender

(N=284)	Total		Male		Female
(N=284)	N	Per cent	N	Per cent	N	Per cent
TSH level (mIU/L)
1	41	14	22	8	19	7
2	35	12	21	7	14	5
3	35	12	20	7	15	5
4	35	12	16	6	19	7
5	35	12	20	7	15	5
6	36	13	19	7	17	6
7	33	12	20	7	13	5
8	12	4	9	3	3	1
9	13	5	6	2	7	2
10–15	9	3	5	2	4	1
Age at testing
4	211	75	118	42	93	33
5	65	23	36	13	29	10
6	7	2	4	1	3	1
Maternity hospital
Brussels	190	67	117	41	73	26
Wallonia	93	33	41	14	52	18
Flanders	1	0	–	–	1	0
Home at examination
Brussels	103	37	57	20	46	16
Wallonia	131	47	70	25	61	22
Flanders	45	16	28	10	17	6
Children ethnicity
Europe (Caucasian)	226	85	129	48	97	36
Asian	3	1	2	1	1	0
Sub-Saharan Africa	13	5	5	2	8	3
North Africa	25	9	14	5	11	4
Mother ethnicity
Europe (Caucasian)	226	83	130	48	96	35
Asia	5	2	2	1	3	1
Sub-Saharan Africa	15	6	6	2	9	3
North Africa	26	10	15	6	11	4
Father ethnicity
Europe (Caucasian)	228	84	129	48	99	37
Asia	2	1	–	–	2	1
Sub-Saharan Africa	14	5	5	2	9	3
North Africa	26	10	14	5	12	4