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8%, OR, 0.83; 95% CI, 0.51-1.36; I2 = 53%; low dose 15.6% vs 21.3%, OR, 0.74; 95% CI, 0.32-1.68; I2 = 0%). No significant difference was observed between the vitamin D supplementation and placebo groups regarding the length of ICU stay (standard mean difference [SMD], - 0.30; 95% CI, - 0.61 to 0.01; I2 = 60%), length of hospital stay (SMD, - 0.17; 95% CI, - 041 to 0.08; I2 = 65%), and duration of mechanical ventilation (SMD, - 0.41; 95% CI, - 081 to 0.00; I2 = 72%). In conclusion, this meta-analysis suggested that the administration of