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Table 2 Prevalence of vitamin D inadequacy stratified for seasons.

From: Vitamin D inadequacy in Belgian postmenopausal osteoporotic women

  1. Spring 2. Summer 3. Fall 4. Winter
<30 nmol/L 15,3% 9,9% 17,5% 20,9%
<50 nmol/L 45,3% 39,1% 44,5% 43,0%
<75 nmol/L 90,8% 86,9% 85,3% 85,4%
<80 nmol/L 93,6% 89,4% 91,0% 90,2%