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table 3 GRADE quality of evidence of vitamin D versus placebo on IBS

From: The efficacy of vitamin D supplementation for irritable bowel syndrome: a systematic review with meta-analysis

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
  1. IBS irritable bowel syndrome, IBS-QoL IBS-quality of life, IBS-SSS IBS-severity scoring system, IBS-TS IBS-total score