Table 1.

Vitamin D values by gender and seasons.

	Vitamin D (ng/mL) (Overall)			Vitamin D categories
	n	Median (min–max)	p value	<20	≥20	p value
Women
December–February (I)	2995	11 (3–70)		2294 (76.6%)	701 (23.4%)	<0.001
March–May (II)	2533	10.2 (3–140)		2044 (80.7%)	476 (19.3%)
June–August (III)	1911	10.3 (3–140)	<0.001	1541 (80.6%)	357 (19.4%)
September–November (IV)	1703	14.8 (3–140)		1191 (69.9%)	491 (30.1%)
All women
All seasons	9142	12.7 (3–140)		2344 (25.6%)	6798 (74.4%)
Men
December–February (I)	773	19 (3–70)		429 (55.5%)	344 (44.5%)	<0.001
March–May (II)	746	14.8 (3–86.9)		578 (77.5%)	163 (22.5%)
June–August(III)	553	15.4 (3–88)	<0.001	393 (71.1%)	156 (28.9%)
September–November (IV)	520	23.1 (3–71.8)		171 (32.9%)	339 (67.1%)
All men
All seasons	2592	18.2 (3–88)		1110 (42.8%)	1482 (57.2%)
Total
All seasons	11,734