Table 2

- Effect of age on serum vitamin D level of residents in Molidawa Daur Autonomous Banner.

Age group	n (%)	Median (nmol/L)	Kruskal-Wallis test
Age group	n (%)	Median (nmol/L)	H	P-value
0~3 years	1535 (30.8)	98.2^{,†, ‡, §,*,‡‡}	2274.8	<0.001
4~6 years^‡‡	700 (14.05)	59.0^{,†, ‡, §,*,‡‡}
7~11 years^**	963 (19.3)	46.0^{,†, ‡,*}
12~17 years^†	430 (8.6)	36.7^†
18~30 years^*	790 (15.9)	36.2^,†,‡,*
31~50 years^‡	464 (9.3)	37.9^‡
51~82 years^§	100 (2.0)	44.3^*,§
Minors	3628 (72.8)	63.5	875.3	<0.001
Adults^††	1254 (25.2)	36.7
Elders^§	100 (2.0)	44.3^*,§

The labels *,†,‡, §,**,††, and ‡‡ indicate that the distribution of median serum vitamin D in different age groups was significantly different after Bonferroni correction (p<0.05/21). The labels § and †† indicate that the distribution of median serum vitamin D in minors, adults, and elders was significantly different after Bonferroni correction (p<0.05/3).