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Table 4 Overview of risk-of-bias assessments of all included studies and total score

From: Does postural stability differ between adolescents with idiopathic scoliosis and typically developed? A systematic literature review and meta-analysis

Author/year Risk-of-bias selection Risk-of-bias comparability Risk-of-bias exposure/outcome Total score
0–6 points
Item 1 Item 2 Item 3 Item 4 Item 5 Item 6
Sahli et al. 2013 [42] 1 1 1 0 1 1 5
Park et al. 2013 [43] 0 1 0 0 1 1 3
De Santiago et al. 2013 [44] 0 0 0 0 1 1 2
Stylianides et al. 2013 [45] 0 1 0 0 1 1 3
Gruber et al. 2011 [46] 0 1 1 0 1 1 3
Dalleau et al. 2011 [47] 0 1 1 0 1 1 4
Valles et al. 2009 [48] 0 1 0 0 1 0 2
Beaulieu et al. 2009 [49] 1 1 1 0 1 1 5
Zabjek et al. 2008 [50] 0 0 0 0 1 1 2
Dalleau et al. 2007 [51] 0 1 0 0 1 1 3
Simoneau, et al. 2006 [52] 0 1 0 0 1 1 3
Chow et al. 2006 [53] 1 1 0 0 1 1 4
Simoneau et al. 2006 [54] 0 0 0 0 1 1 2
Allard et al. 2004 [55] 1 1 0 0 1 1 4
Silferi et al. 2004 [56] 0 0 0 0 1 1 2
Nault et al. 2002 [57] 0 0 0 0 1 1 2
Chen et al. 1998 [58] 0 1 0 0 1 1 3
Sahlstrand et al. 1978 [59] 1 1 0 0 1 1 4
  1. Item 1: Is the control group representative for normal adolescents? 1 = Community control; 0 = Hospital controls/No description of source. Item 2: Was other pathology excluded that possibly influences the outcome? 1 = Yes; 0 = No or no description. Item 3: Were the same in- and exclusion criteria (except for the spinal deformity) used for AIS and healthy adolescents? 1 = Yes; 0 = No or no description. Item 4: Were the observers blinded to AIS/healthy adolescent status1 = Yes; 0 = No or not documented. Item 5: Was the data collection performed in the same standardised way for AIS cases and healthy adolescents? 1 = Yes; 0 = No or not documented. Item 6: Was the primary outcome parameter for AIS cases and healthy adolescents available? 1 = Available for > 90% of AIS and healthy adolescents, 0 = available for < 90% of AIS or healthy adolescents. Total score: Ranked according to total score; 0–2 high, 3–4 moderate and 5–6 low risk of bias