Table 2 Serum concentration of 25(OH)D among children and adolescents stratified by gender and living area.

Age (years)*	Male (25(OH)D: mg/L)				Female (25(OH)D: mg/L)				Z	P value	Urban area (25(OH)D: mg/L)				Rural area (25(OH)D: mg/L)				Z	P value
Age (years)*	N	Median	25%	75%	N	Median	25%	75%	Z	P value	N	Median	25%	75%	N	Median	25%	75%	Z	P value
6	93	28.25	23.50	32.96	87	25.62	21.65	30.49	−1.732	0.083	87	25.55	22.77	31.36	93	26.75	22.05	32.40	0.468	0.64
7	117	24.49	20.01	29.93	125	24.25	20.07	30.51	−0.302	0.742	114	24.98	18.88	30.01	128	24.19	20.48	30.16	−0.235	0.815
8	138	24.99	20.21	29.43	122	23.50	19.31	27.80	−1.41	0.158	131	25.49	20.31	29.41	129	23.43	19.46	28.26	−1.643	0.1
9	137	23.28	19.55	28.39	127	23.31	19.82	28.40	0.315	0.753	128	22.21	18.82	26.98	136	25.22	20.23	29.80	2.985	0.000
10	125	24.92	20.20	30.23	132	22.15	17.77	26.55	−2.853	0.004	139	22.33	18.14	27.03	118	24.88	19.01	29.09	1.719	0.086
11	128	23.02	20.28	28.43	146	19.44	16.45	25.02	−4.821	0.000	129	20.93	17.16	25.74	145	21.65	18.34	28.61	1.715	0.086
12	152	21.13	16.84	27.27	134	19.02	14.88	24.15	−2.503	0.012	148	19.53	15.30	25.56	138	20.40	16.80	25.20	0.715	0.475
13	133	22.42	17.64	27.64	133	20.32	15.26	24.17	−2.687	0.007	141	20.32	15.35	26.18	125	21.91	17.47	26.82	1.975	0.048
14	40	19.38	16.46	25.53	40	23.03	15.64	25.55	0.322	0.747	35	18.15	15.36	27.80	45	20.94	17.18	25.47	0.679	0.497
15	88	22.10	15.61	28.95	101	19.09	16.12	23.86	−2.181	0.029	94	18.21	13.95	23.86	95	22.06	18.27	28.97	4.448	0.000
16	121	22.34	18.20	27.25	117	19.45	15.59	24.17	−3.076	0.002	104	19.05	14.82	23.10	134	22.17	18.21	27.51	4.054	0.000
17	43	18.77	13.40	23.10	39	17.08	13.42	23.02	−0.659	0.51	40	13.49	11.01	20.42	42	20.91	17.77	24.97	4.467	0.000
Total	1315	23.23	18.76	29	1303	21.43	17.23	26.45	−6.503	0.000	1290	21.62	17	26.92	1328	22.89	18.83	28.47	5.478	0.000

P values are for the comparison of serum concentration of 25(OH)D between genders and between living areas.
Bold values indicate statistically significant P values.
For multiple comparisons among different age, the P value is 0.00074627 after Bonferroni correction.
An asterisk (*) denotes significant difference on Serum concentration of 25(OH)D among different age (H = 198.569, P < 0.0007).
25(OH)D concentration of 25‐hydroxyvitamin D.

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