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Table 1 Methodological quality assessment of included studies

From: Genes associated with persistent lumbar radicular pain; a systematic review

Study External validity Sources of Bias Statistics
  Findings can be generalised Sample size cases Description sample Follow up rate Appropriate outcomes reported Adjustment confounding Correction multiple testing
Andrade et al. (2013) [39] No n = 10 Yes 100% Yes No No
Andrade et al. (2011) [38] No n = 10 Yes 100% Yes No No
Gebhardt et al. (2006) [37] Yes n = 31 Yes 88% Yes Yes Yes
Hasvik et al. (2014) [21] Yes n = 118a Yes 95% No Yes Yes
Jacobsen et al. (2013) [44] Yes n = 260a Yes 91% Yes Yes Yes
Jacobsen et al. (2012) [43] Yes n = 258a Yes 89% Yes Yes Yes
Karppinen et al. (2008) [29] Yes n = 153 Yes 97% Yes No No
Moen et al. (2014) [31] Yes n = 252a Yes 91% No Yes Yes
Olsen et al. (2012) [20] Yes n = 258a Yes 92% Yes Yes Yes
Rut et al. (2014) [40] Yes n = 176 Yes 100% Yes Yes No
Schistad et al. (2014) [42] Yes n = 108a Yes 90% Yes Yes No
Schistad et al. (2014) [30] Yes n = 121a Yes 91% No No No
Scuderi et al. (2009) [45] No n = 47 Yes 100% Yes No No
Takeuchi et al. (2007) [41] No n = 27 Yes 100% Yes Yes No
Tegeder et al. (2006) [24] Yes n = 168 Yes 88% Yes Yes NA
  1. NA, not applicable, ND, not described
  2. aemanates from the same patient population