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Impact of vitamin D on asthma exacerbations requiring systemic corticosteroids
| Study reference | Sample size (VitD/placebo) | Exacerbations requiring corticosteroids (VitD) | Exacerbations requiring corticosteroids (placebo) | Risk ratio (95% CI) |
|---|---|---|---|---|
| Castro 2014 [31] | 202/209 | Decreased | Increased | 0.55 [0.35, 0.93] |
| Jensen 2016 [35] | 12/12 | Decreased | Increased | 0.68 [0.31, 1.55] |
| Martineau 2015 [34] | 124/126 | Decreased | Increased | 0.74 [0.44, 1.28] |
| Total (95% CI) | 338/347 | 0.65 [0.46, 0.90] |
