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Table 2 Risk-of-bias assessment tool for case-control methodology

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

Item Scoring
Selection:
 1. Is the control group representative for normal adolescents? 1 = Community control; 0 = Hospital controls;
0 = No description of source
 2. Was other pathology excluded that possibly influences the outcome? 1 = Yes; 0 = No or no description
Comparability:
 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
Exposure/outcome:
 4. Were the observers blinded to AIS/healthy adolescent status? 1 = Yes; 0 = No or not documented
 5. Was the data collection performed in the same standardised way for AIS cases and healthy adolescents? 1 = Yes; 0 = No or not documented
 6.a 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
  1. aModified for AIS population