Table 2 Quality checklist of the reported ‘effect sizes’ in eight randomized sham-controlled studies included in a previous review on pressure pain threshold changes after spinal manipulation
First author Year | Did the authors report the between-group effect size? (Yes/No) | 1) Did the authors report the ‘exact’ formula they used? (Yes/No/NA) 2) Or, at least: - Did they provide a reference? (Yes/No/NA) If so, - Was this an “exact” reference? | Did they report: 1) Number of study participants in each group 2) Exact mean values 3) Exact standard deviations | Did they report the 95% CI of their effect size, or of their within group ‘effect’ size? (Yes/No) | Was it possible to calculate between-group effect size based on data provided in the articles? |
|---|---|---|---|---|---|
Ruiz Saez 2007 | No, only the within-group comparison | 1) No 2) -Yes -Yes | 1) Yes 2) Yes 3) Yes | No | Yes |
Srbely 2013 | No, not even the within-group comparison | 1) NA | 1) Yes 2) Yes 3) Yes | NA | Yes |
Fernandez de la Penas 2008 | No, only the within-group comparison | 1) No 2) -Yes - No | 1) Yes 2) Yes 3) Yes | No | Yes |
Fernandez de la Penas 2007 | No, only the within-group comparison | 1) No 2) -Yes -No | 1) Yes 2) Yes 3) Yes | No | Yes |
Hamilton 2007 | No, only the within-group comparison | 1) No 2) - Yes - No | 1) Yes 2) Yes 3) Yes | No | Yes |
Yu 2012 | No, not even the within-group comparison | 1) NA | 1) Yes 2) Yes 3) Yes | NA | Yes |
Thomson 2009 | No, only the within-group comparison | 1) No 2) - No - No | 1) Yes 2) Shown in figures, so lack of precision. −3) Yes | No | Yes |
Fryer 2004 | No, only the within-group comparison | 1) No 2) - No - No | 1) Yes 2) Yes 3) Yes | No | Yes |