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No. Name of Lifestyle Third Class Second Class First Class Type No. of Studies
1carotenesVitamin AVitaminFood compositionNo statistical significance factor2
2Pro-vitamin A carotenoidsVitamin AVitaminFood compositionNo statistical significance factor1
3RetinolVitamin AVitaminFood compositionNo statistical significance factor5
4Retinyl palmitateVitamin AVitaminFood compositionNo statistical significance factor1
5serum retinolVitamin AVitaminFood compositionNo statistical significance factor1
6Vitamin AVitamin AVitaminFood compositionNo statistical significance factor2