Table 10.

Relative frequency (prevalence) of two definitions of serum vitamin D deficiency before and after treatment with a vitamin D2 injection + a D2 tablet.

vitamin D2 injection + D2 tablet	Before treatment		95% Confidence	After treatment		95% Confidence
(Total examined N = 1585)	N	%	Interval	N	%	Interval
Severe vitamin D deficiency (serum conc < 10 ng/ml)	622	39.2	(36.9 to 41.7)	72	4.5	(3.6 to 5.7)
vitamin D deficiency (serum conc < 20 ng/ml)	1462	92.2	(90.8 to 93.5)	1172	73.9	(71.7 to 76.1)