Study design | Source of performance bias | Reported or suspected | Risk of performance bias |
---|---|---|---|
BA | Confounding factor or time-related trend | Yes | High/probably high |
No | Low/probably low | ||
Unclear | Unclear | ||
CI and BACI | Confounding factor or contamination of study groups | Yes | High/probably high |
No | Low/probably low | ||
Unclear | Unclear | ||
Time-related trend | Yes or No | Low (N/A for CI) |