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Table 6 Summary of quality scores and quality classification for 12 articles included in a systematic review on spinal manipulation and pressure pain threshold

From: The regional effect of spinal manipulation on the pressure pain threshold in asymptomatic subjects: a systematic literature review

  First Author, Year [ref] Score Quality scale
SHAM STUDIES Yu, 2012 [15]; Ruiz Saez, 2007 [16] 8/9 High
Srbely, 2013[17] 7.5/9 High
Fernadez de la Penas, 2008 *[18] 7/9 Medium
Fernadez de la Penas, 2007 [19]; Hamilton [20] 6.5/9 Medium
Thomson, 2009 [13] 6/9 Medium
Fryer, 2004 [21] 5/9 Medium
COMPARISON STUDIES Alonso Peres, 2016 [22] 8.5/9 High
Oliveira Campelo, 2010 [23] 8/9 High
Jordon, 2016 [24] 7.5/9 High
Hamilton, 2007 [20]; Fernandez de las Penas, 2008 [18] 7/9 High
Fernadez de la Penas, 2007 [19] 6.5/9 Medium
Thomson, 2009 [13] 6/9 Medium
Fryer, 2004 [21] 5/9 Medium
Bishop, 2011 [25] 3.5/9 Low
  1. Classification: Low: 0–4.5pts; Medium: 5–6.5pts; High: 7-9pts. *Some articles were listed twice in the table, as they used a sham procedure and compared a spinal manipulation to another intervention