Table 1 Median 25 hydroxyvitamin D level for the Calgary population studied, and the proportion of the population below levels representing the Institute Of Medicine’s[31] categories of vitamin adequacy: deficiency (<30 nmol/L), estimated average requirement (40 nmol/L) and recommended dietary allowance (50 nmol/L)

Median 25 hydroxyvitamin D level

65

71

Proportion of individuals <30 nmol/L

0.10

0.07

Proportion of individuals <40 nmol/L

0.19

0.15

Proportion of individuals <50 nmol/L

0.30

0.24