Unit Eight: Principles of Critical Appraisal - Cochrane Public Health ...
Unit Eight: Principles of Critical Appraisal - Cochrane Public Health ...
Unit Eight: Principles of Critical Appraisal - Cochrane Public Health ...
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Blinding outcome assessors<br />
Detection bias –<br />
• Blinding <strong>of</strong> outcome assessors to prevent<br />
systematic differences between groups in the<br />
outcome assessment<br />
Question Four: checklist<br />
Blinding<br />
• Were the outcome assessors blind to<br />
the intervention status <strong>of</strong> participants?<br />
• Yes<br />
• No<br />
• Not applicable (if self-reported)<br />
• Not reported<br />
Data collection methods<br />
• More <strong>of</strong>ten subjective outcomes in<br />
health promotion<br />
• Require valid and reliable tools<br />
Question Five: checklist<br />
Data collection methods<br />
• Were data collection methods shown or<br />
known to be valid and reliable for the<br />
outcome <strong>of</strong> interest?<br />
Withdrawals from study<br />
Attrition bias -<br />
• Systematic differences between groups in<br />
losses <strong>of</strong> participants from the study<br />
• Look at withdrawals, drop-outs<br />
Question Six: checklist<br />
Withdrawals and drop-outs<br />
• What is the percentage <strong>of</strong> participants<br />
completing the study?<br />
4
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