Table 2.
Age group | Study | Study | Average serum vitamin D levels | Prevalence of vitamin D <75nmol/L | |
---|---|---|---|---|---|
Years* | n | n | (nmol/L) | (%) | |
<16 | 698 | Bener et al.42,43# | 170 | 46.2±23.0 | 85 |
Bener et al.37 | 464 | 66.9±24.7 | 83 | ||
Racinais et al.39 | 64 | NS | 100 | ||
Weighted average§ | (60.6-62.2) | (85.9-86.4) | |||
61.4±10.0 | 86.2±2.4 | ||||
16-30 | 163 | Hamilton et al.40 | 92 | NS | 100 |
Shrief and Rizk38 | 71 | NS | 97 | ||
Weighted average | ^ | 93.9±5.3 | |||
(93.5-94.3) | |||||
>30 | 838 | Mahdy et al.41 | 340 | 29.2 | 97 |
El-Menyar et al.44 | 498 | 35.9±27.5 | 91 | ||
Weighted average | 33.2±3.4 | 93.4±3.1 | |||
(31.9-32.5) | (93.1-93.6) | ||||
O verall° | 1699 | Weighted overall average | 45.3±14.3$ | 90.4±7.2** | |
(44.6-46.0) | (90.1-90.8) |
*Stratifying vitamin D level by age was carried out from the average age of the study population (Table 1). Stratifying vitamin D level by gender from the selected reports was not possible given the way in which the data were in the original studies.
°Overall represents the entire age range from <16 to >30 years.
#The same study reported in two publications, with additional information in the more recent report.
§Data represent weighted average±standard deviation (SD). Numbers in parentheses are 95% confidence intervals (CI) for weighted average.
^Data in three of the selected studies (ref. ns. 38-40) did not allow this value to be generated.
$Calculated from 1472 subjects extracted from 4 of the selected studies in which the relevant information was available (ref. ns. 37, 41-44).
**Calculated from the 7 selected studies (n=1699). NS, values not stated in the original report.