Bias due to confounding |
1 |
3 |
? |
? |
2 |
3 |
Bias in selection of participants into the study |
1 |
1 |
1 |
1 |
1 |
1 |
Bias in classification of interventions |
1 |
1 |
1 |
1 |
1 |
1 |
Bias due to deviations from intended interventions |
1 |
2 |
1 |
2 |
1 |
2 |
Bias due to missing data |
1 |
1 |
1 |
1 |
1 |
1 |
Bias in measurement of outcomes |
2 |
2 |
2 |
2 |
2 |
2 |
Bias in selection of the reported result |
1 |
1 |
? |
? |
2 |
2 |