Association between vitamin D deficiency and mortality in critically ill adult patients: a meta-analysis of cohort studies

Table 2 ICU length of stay among studies

Study	Year	Vitamin D classification	ICU length of stay (days)
Amrein *et al* . [22]	2014	Deficiency, <20 ng/ml	6.9 (9.8)^a
		insufficiency, 20 to 30 ng/ml	4.9 (7.7)^a
		sufficiency, >30 ng/ml	5.2 (6.5)^a
Aygencel *et al* . [19]	2013	Insufficiency, <20 ng/ml	9 (5, 14)^b
Aygencel *et al* . [19]	2013	sufficiency, ≥20 ng/ml	8 (5, 13)^b
Hu *et al* . [18]	2013	Deficiency, <20 ng/ml	10.5 (6.8, 25.3)^b
		insufficiency, 20 to 30 ng/ml	8.6 (6.9, 20.5)^b
		sufficiency, >30 ng/ml	15.2 (10.3, 23.6)^b
Nair *et al* . [21]	2012	Deficiency, <10 ng/ml	12 (2, 14)^b
		insufficiency,10 to 20 ng/ml	7 (4, 15)^b
		sufficiency, >20 ng/ml	4 (3, 10)^b
Higgins *et al* . [20]	2012	Deficient, ≤12 ng/ml	10.6 ± 8.4^c
		insufficient, 12 to 24 ng/ml	6.8 ± 6.0^c
		sufficient, >24 ng/ml	5.9 ± 5.4^c
Venkatram *et al* . [8]	2011	Deficiency, <20 ng/ml	4.3 ± 4.5^c
		insufficiency, 20 to 30 ng/ml	3.7 ± 3.9^c
		sufficiency, >30 ng/ml	4.2 ± 3.7^c
Braun *et al* . [17]	2011	-	-

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