Table IV.

Mean (95% CI) vitamin D (25(OH)D in nmol/L) levels during two seasons among patients from different geographical regions.

	Norway n = 249	Europe, America, Southeast Asia n = 83	Middle East, Africa and South Asia n = 240
	Mean (95% CI)	Mean (95% CI)	Mean (95% CI)
Summer–fall June 1–Nov 30 (n = 256)	72 (67–77)1	50 (44–57)2	35 (31–39)3
Winter–spring Dec 1–May 31 (n = 316)	56 (53–60)	41 (36–47)	29 (27–32)

Note: Differences in mean vitamin D level between seasons were: ¹p < 0.001, ²p = 0.047, ³p = 0.021.