FIGURE 5.
Total vitamin A (μg RE/day) and risk of hip fractures. D, diet; HR, hazard ratio; F, females; IWHS, Iowa Women's Health Study; NHS, Nurse's Health Study; PC, prospective cohort; Q, quantiles; RoB, Risk of Bias; RR, relative risk; S, supplements; WHIOS, Women's Health Initiative Observational Study. Study duration represents either mean, median or maximum follow‐up. 1The intake was adjusted for energy using the residual method before categorisation; 2 Numbers per category were estimated from the total sample assuming equal distribution of participants per category.