(a)

Dependent variable	Independent variables	Odds ratio	CI (95%)	P value
	25OHD	1.6	1.23–1.97	<0.001
	Age	0.9	0.8–1	0.9
PCOS	WC	0.89	0.79–1.01	0.2
	BMI	1.16	0.89–1.43	0.5
	Insulin concentration	1.02	0.89–1.15	0.8

25OHD: 25 hydroxy vitamin D; PCOS: polycystic ovary syndrome; WC: waist circumference; BMI: body mass index.