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Table 2 The type and number of component items contained in critical appraisal tools per study design.

From: A systematic review of the content of critical appraisal tools

Type of items Design-specific critical appraisal tool components Generic critical appraisal tool components Total
  Systematic reviews Experimental studies Diagnostic studies Observational studies Qualitative studies Exp & Obsa studies All study designs  
Study aims and justification 35 27 5 18 17 4 11 117
Methodology used 38 1 0 0 0 0 1 40
Sample selection 30 62 12 37 10 10 14 175
Randomization 2 65 1 5 0 6 5 84
Attrition 4 59 3 23 0 8 8 105
Blinding 1 77 5 8 0 5 7 103
Outcome measure characteristics 41 46 3 33 2 9 19 153
Intervention 7 42 3 13 0 5 12 82
Data analyses 83 91 14 54 12 14 27 295
Bias 24 14 2 5 0 3 6 54
External validity 72 50 12 30 27 9 27 227
Miscellaneous 11 12 7 5 7 2 6 50
Total 348 546 67 331 75 75 143 1485