Table 3.

Children's vitamin D level in different regions of China.

Year	Region	Age	Detection method	Detection rate of Sufficiency %	Mean ± SD (ng/mL)
2011–2013	Guangzhou (37)	0–14	ELISA†	36.6	28.3 ± 8.4
		7–14		11.5	23.0 ± 5.9
2012–2013	Beijing (39)	0–14	MS-MS‡	12.9	22.1 ± 8.5
2017	Jiaxing of Zhejiang (43)	3–6	MS-MS	–	23.0 ± 7.7
2013	Shaoxing of Zhejing (44)	0–9	CLIA§	45.8	29.8 ± 12.8
2017	Shanxi (45)	9–16	CLIA	34.6	18.0 ± 6.4
2012	Guangxi (46)	6–13	ELISA	22.5	22.9 ± 0.4
2017–2018	Mianyang of Sichuan (47)	0–8	MS-MS	17.1	18.6
2016	Shenmu of Shanxi (48)	0–14	ELISA	14.8	13.3 ± 6.0
2015–2016	Heilongjiang (49)	0–6	MS-MS	–	24.2 ± 10.0
2011–2016	Wenzhou of Zhejiang*	6–14	CLIA	19.0	22.3 ± 8.9
2013	Tibetan Highland*	6–14	CLIA	3.37	18.2 ± 6.0

^†ELISA stands for enzyme-linked immunosorbent assay.

^‡MS-MS stands for tandem mass spectrometry.

^§CLIA stands for chemiluminescence immunoassay.

^*Children in our study.