Lo 2008.
Methods | Interrupted time series study | |
Participants | Taiwan Pregnant women (2001 to 2005) |
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Interventions | Financial interventions: 1) Increase in vaginal birth after caesarean (VBAC) fee to the same level as caesarean section (April 2003); 2) Increase in vaginal birth fee to that of caesarean section (May 2005) | |
Outcomes | Caesarean section and VBAC rates | |
Notes | Baseline (control group) CS rate: 29% Date of study: 2001 to 2005 Funding: not stated Conflict of interest: not stated |
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Risk of bias | ||
Bias | Authors' judgement | Support for judgement |
Intervention independent of other changes? | Unclear risk | Insufficient information provided in the report |
Shape of the intervention effect pre‐specified? | Low risk | Point of analysis is the point of intervention |
Intervention unlikely to affect data collection? | Low risk | Considered unlikely to affect data collection |
Incomplete outcome data (attrition bias) All outcomes | Unclear risk | No reference to missing data |
Selective reporting (reporting bias) | Low risk | Data on all prespecified outcomes reported |
Knowledge of the allocated interventions adequately prevented during the study? | Low risk | Main outcome of interest (mode of delivery) objective |
Other bias | Low risk | No evidence of other bias |