| Conversion of serum retinol concentration |
Trinidad 2015; Vinod Kumar 2009a (C) | μg/dL to μmol/L |
| Conversion of Median values to Mean | Lopez‐Teros 2013 | Method suggested by Wan |
| Estimation of SD |
Solon 2000; Rahman 2015 (C); Trinidad 2015 |
Based on CI SD = SE/sqrt(N) SD = SE/sqrt(N) |
| Adjustment of clustering |
Rahman 2015 (C); Vinod Kumar 2009a (C); Vinod Kumar 2014 (C) |
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