Table 12 Summary of quality scores and quality classification for 18 articles included in a systematic review on the effect of spinal manipulation on ‘brain function’
Type of study | First author / Year [ref] | Scorea (risk of bias and external validity) | Quality classification |
|---|---|---|---|
Sham studies | Sparks, 2017 [9] | 5.5/7 (79%) | acceptable |
Baarbéé, 2018 [15] | 3.5/6 (58%) | medium | |
Lelic, 2016 [14] | 2.5/6 (42%) | medium | |
Comparison studies | Christiansen, 2018 [28] | 5/6 (83%) | acceptable |
Gay, 2014 [22] | 5/7 (71%) | acceptable | |
Kelly, 2000 [29] | 3.5/6 (58%) | medium | |
Dishman, 2002 [17] Haavik-Taylor, 2010a [26] Haavik-Taylor, 2010b [21] Fryer, 2012 [16] Niazi, 2015 [27] | 2.5/6 (42%) | medium | |
Haavik-Taylor, 2007a [20] Haavik-Taylor, 2007b [25] Haavik-Taylor, 2008 [28] Dishman, 2008 [23] Ogura, 2011 [19] HaaviK, 2016 [24] Inami, 2017 [8] | 2/6 (33%) | low |