borderline significantp = 0.061
Meta-regression analysis showed that the association between low serum 25-OHD and mortality was affected by male gender (OR = 1.22 [1.08, 1.39], p = 0.002) ( Figure 5A ), diabetes (OR = 0.88 [0.79, 0.98], p = 0.019) ( Figure 5B ); borderline significant for age (OR = 0.93 [0.87, 1.00], p = 0.061) and hypertension (OR = 0.93 [0.87, 1.00], p = 0.052).