Table 1.

General characteristics for children from Shanghai, Haimen and Taizhou, China, in 2014

	Male		Female
	n	%	n	%	χ2	p Value
Total	739	52.67	664	47.33
Age (years)					0.788	0.852
8	116	15.70	111	16.72
9	246	33.29	215	32.38
10	237	32.07	204	30.72
11	140	18.94	134	20.18
BMI					11.56	0.003
Normal	531	71.85	443	66.72
Overweight	110	14.88	145	21.84
Obese	98	13.26	76	11.45
Area					6.182	0.046
Minhang	294	39.78	226	34.04
Haimen	234	31.66	214	32.23
Yuhuan	211	28.55	224	33.73
UIC (μg/L)*					4.198	0.241
<100	122	17.35	132	20.63
100–199	282	40.11	226	35.31
200–299	171	23.14	158	24.69
≥300	128	17.32	124	19.38
Iodised salt consumption†					0.015	0.901
No	250	36.39	235	36.72
Yes	437	63.61	405	63.28

*A total of 60 missing: 36 (60.00%) were male and 24 (40.00%) were female.

†A total of 76 missing: 52 (68.42%) were male and 24 (31.58%) were female.

BMI, body mass index; UIC, urinary iodine concentration.