table 3 GRADE quality of evidence of vitamin D versus placebo on IBS
Outcome | Risk of bias | Inconsistency | Indirectness | Imprecision | Publication bias | Certainty |
|---|---|---|---|---|---|---|
IBS-SSS | Not serious | Serious | Not serious | Serious | Serious | ⨁○○○ Very low |
IBS-QoL | Serious | Serious | Not serious | Serious | Serious | ⨁⨁○○ Low |
IBS-TS | Not serious | Serious | Not serious | Serious | Serious | ⨁○○○ Very low |