Table 2.

Mean 25(OH)D according to sunbathing habits.

	25(OH)D in summer (nmol/L)			25(OH)D in winter (nmol/L)
	N*	Mean	SD	N*	Mean	SD
Avoids sun	36	44.7	1.9	40	33.5	1.9
Arms/face	66	54.7	2.0	78	40.6	1.5
Whole body	206	63.1	1.3	240	46.3	1.0
P value (ANOVA)	P < 0.0001			P < 0.0001
Arms/face vs. avoids sun†	10.1 (1.8–18.3); p = 0.01			7.0 (0.5–13.6); p = 0.03
Whole body vs. avoids sun†	18.4 (11.2–25.6); p < 0.001			12.8 (7.1–18.6); p < 0.001
Arms/face vs. whole body†	8.4 (2.7–14.0); p = 0.001			5.8 (1.4–10.1); p = 0.006

* 10 subjects did not provide their sun-bathing habits data

† Post-hoc analysis using Tukey test; presented as differences in mean (95% CI); p value