Table 1.

Vitamin D (nmol/L) before and after summer in men and women classified by glucose tolerance status.

Vitamin D (nmol/L)	Before summer mean (SD)	After summer mean (SD)	P value
Men NGT n=40	53.3 ± 19.0	64.0 ± 22.0	<0.001
Men IGT + T2DM n=31	54.9 ± 27.4	69.2 ± 27.0	<0.001
Women NGT n=62	56.5 ± 17.8	67.9 ± 17.7	<0.001
Women IGT + T2DM n=25	55.0 ± 27.3	62.4 ± 19.4	0.004
All participants N=158	55.1 ± 21.7	66.3 ± 21.0	<0.001
Second summer season N=68	56.0 ± 22.0	67.5 ± 22.2	<0.001

Values are reported as mean ± standard deviation. Abbreviations: NGT, normal glucose tolerance; IGT, impaired glucose tolerance, T2DM, type 2 diabetes mellitus.