Fig. 2
From: Vitamin D deficiency as a risk factor for dementia and Alzheimer’s disease: an updated meta-analysis
HRs of association between dementia and vitamin D deficiency (serum 25(OH)D < 20 ng/ml). The size of each square is proportional to the study’s weight. The estimated pooled HR was 1.32 (95%CI, 1.16 to 1.52) with high statistical significance (P < 0.0001). There was moderate heterogeneity among the studies (I2 = 45.1%)