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Relative frequency (prevalence) of two definitions of serum vitamin D deficiency before and after treatment with a vitamin D2 injection.
| vitamin D2 injection (Total examined | Before treatment | 95% Confidence | After treatment | 95% Confidence | ||
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| N = 411) | N | % | Interval | N | % | Interval |
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| Severe vitamin D deficiency (serum conc < 10 ng/ml) | 124 | 30.2 | (25.9 to 34.7) | 41 | 10 | (7.4 to 13.2) |
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| vitamin D deficiency (serum conc < 20 ng/ml) | 364 | 88.6 | (85.2 to 91.4) | 326 | 79.3 | (75.2 to 83) |
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