The
following information was extracted from each study: author, year
of publication, study design (case-control or cohort), country of
origin, number of participants, characteristics of participants (e.g.,
gender and age), variables adjusted for in the analysis, RR (or OR)
estimates with 95% CIs for the highest versus lowest categories of
vitamin A intake, retinol intake or blood retinol leve
Thefollowing information was extracted from each study: author, yearof publication, study design (case-control or cohort), country oforigin, number of participants, characteristics of participants (e.g.,gender and age), variables adjusted for in the analysis, RR (or OR)estimates with 95% CIs for the highest versus lowest categories ofvitamin A intake, retinol intake or blood retinol leve
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