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Table 8 Quality items and scores of two studies using V-wave as outcome measures included in a systematic review on the effect of spinal manipulation on ‘brain function’

From: Unravelling functional neurology: does spinal manipulation have an effect on the brain? - a systematic literature review

1st Author Yr of publication Ref -Were study subjects in sham controlled studies reported to be blind? (Yes / No / Unclear) -If yes / unclear, was the blinding tested for success? (Yes / No) -If yes, was it successful? (Yes / No) -Were study subjects in studies with control group reported to be naive? (Yes / No / Unclear) -Was the origin of the subjects reported (Yes / No) -If yes, does it allow to exclude any interest? (Yes / No / Unclear) Were study subjects reported to have been randomly allocated to study groups? (Yes / No / Unclear) Were study groups comparable in relation to symptoms when studying symptomatic subjects (duration and pain intensity) (NA when cross-over study design)? (Yes / No) Were the intervention and control(s) well described (at least where and how)? (Yes / No) Was the assessor reported to be blind to group allocation? (Yes / No) Were losses and exclusions of study subjects reported or obvious in result section (including in tables or graphs)? (Yes / No / Unclear) Was the person who statistically analyzed the data reported to be blind to group allocation? (Yes / No) Comments by the technical experts (i) on the statistical analysis, and (ii) in relation to the methodology and/or technical aspects
Quality score (risk of bias, also including an external validity criteria) and classification
Niazi 2015 [27]   -No -No -NA        None in relation to statistics No expert was available in relation to the technical aspects of this outcome measure
2.5/6 (42%) medium NA = No 0 pt Yes 1 pt NA (SCP subjects) -Yes 0.5 pt -No 0 pt No 0 pt Yes 1 pt No 0 pt
Christiansen 2018 [28]   -No -Yes -Yes        None in relation to statistics No expert was available in relation to the technical aspects of this outcome measure
5/6 (83%) acceptable NA = Unclear 0.5 pt Yes 1 pt NA (SCP subjects) -Yes 0.5 pt -No 0 pt Yes 1 pt Yes 1 pt Yes 1 pt
  1. NA Not applicable, SCP “subclinical neck/spinal pain”