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Country‐specific incidence rate ratios (95% CI) of PC according to a doubling of standardized circulating 25‐hydroxy vitamin D concentrations. Conditioned on matching factors and adjusted for BMI and smoking habits. No incidence rate ratios were obtained for EPIC‐Norway due to the small population. p value for heterogeneity between EPIC‐countries was 0.97 and between the EPIC and HUNT2 cohorts was 0.12.
