Table 2

Comments on the included studies

StudyEvidence levelShortcomings of study designShortcomings of data providedLimitations/strengths as presented by study authors
Pirhonen et al 199852cThe Finnish manoeuvre is not predefined as an outcomeNo evaluation of the study design and its limitations regarding the interventions causality
Laine et al 2008284Comparison of two groups not consistent in timeSame data as Stedenfeldt et al 201329No evaluation of the study design and its limitations regarding the interventions causality
Missing key elements of study design
Laine et al 200962cOverlapping data with Laine et al 20137Good integration of results with literature to date
Hals et al 2010144Comparison of two groups not consistent in timeSame data as Stedenfeldt et al 201329No interpretation of the increased use of episiotomy.
No evaluation of the study design and its limitations regarding the interventions causality
No evaluation of the study's limitations
Laine et al 201284Comparison of two groups not consistent in timeThorough evaluation of strengths of the study
No evaluation of the study's limitations
Laine et al 201372cOverlapping data with Laine et al 20096Thorough evaluation of strengths and limitations regarding study design
Stedenfeldt et al 2013294Same data as Laine et al 2008 28 and Hals et al 201014Thorough evaluation of strengths and limitations regarding study design. Presentation of positive and negative results. Thorough presentation of relevant evidence