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

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

	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

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

ISSN: 2045-709X