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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

From: How big is the effect of spinal manipulation on the pressure pain threshold and for how long does it last? – secondary analysis of data from a systematic review

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
  1. NA: Not applicable