Table 1.

Classification of the conclusions according to results reported by authors

Classification	Definition
Unclear	Direction of results differed within reviews due to conflicting results or limitations of individual studies.
No effect	The conclusions provided evidence of no difference between intervention and comparator.
Probably harmful	The conclusions did not claim for firm harmful effect despite the reported negative treatment effect.
Harmful	The conclusions were reported as clearly indicative of a harmful effect.
Probably beneficial	The conclusions did not claim for firm benefits despite the reported positive treatment effect.
Beneficial	The conclusions reported a clear beneficial effect without major concerns regarding the supporting evidence.