Results: There were 643 males and 703 females, with a mean age of 58.0 ± 9.5 years (range 50-84 years). vitamin D deficiency [vDD, serum 25(oH)D levels < 20 ng/ml) was present in 1228 (91.2%) and vitamin D insufficiency [vDI, serum 25(oH)D levels 20-<30 ng/ml] in 92(6.8%). There was no significant difference in prevalence of either vDD or vDI between two age groups and sexes. Serum 25(oH)D levels were negatively correlated with PTH levels (r -0.027, p <0.00001) and bmI (r -0.128, p 0.05). Prevalence of secondary hyperparathyroidism increased from 14.1% to 43.1% from vDI to severe vDD. PTH levels started rising at vitamin D level < 30 ng/ml. However, more than 50% of subjects with severe vDD had PTH levels within normal range. High prevalence of osteopenia (50.2%) and osteoporosis (31.2%) was observed in this population
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