Table 1.

Baseline data of two groups of the study.

		Intervention group	Control group	p valuea
Age (year) (mean ± SD)		60.05 ± 7.75	64.24 ± 4.12	0.04
Sex (N (%))	Male	14	14	0.81
	Female	6	7
25-OH vitamin D (ng/mL) (mean ± SD)		23.20 ± 4.15	23.14 ± 4.29	0.96
Hospital length of stay (day) (mean ± SD)		2.05 ± 0.75	1.95 ± 0.65	0.80

^aUnpaired Student's t-test and chi-squared test based on the data.