Table 5.

Effect of vitamin D supplementation on asthma exacerbations necessitating hospitalization or emergency room visits

Study reference	Sample size (VitD/placebo)	Hospitalization/emergency visits (VitD)	Hospitalization/emergency visits (placebo)	Odds ratio (95% CI)
Tachimoto 2016 [36]	55/36	Reduced	Increased	0.21 [0.02, 2.01]
Jensen 2016 [35]	12/12	No change	No change	1.01 [0.19, 5.67]
Martineau 2015 [34]	124/126	Reduced	Increased	0.39 [0.12, 1.24]
Castro 2014 [31]	202/208	Reduced	Increased	0.31 [0.11, 0.96]
Total (95% CI)	393/382			0.39 [0.19, 0.78]