Fig. 3From: Vitamin D deficiency as a risk factor for dementia and Alzheimer’s disease: an updated meta-analysisHRs of association between AD 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 1.34 (95%CI, 1.13 to 1.60) with high statistical significance (P < 0.0001). There was high heterogeneity among the studies (I2 = 53.1%)Back to article page