Potential biases do not affect results of waiting time studyBMJ 1998; 317 doi: https://doi.org/10.1136/bmj.317.7150.79 (Published 04 July 1998) Cite this as: BMJ 1998;317:79
- Bernard Dowling, Research student.
- Department of Social Policy and Administration, London School of Economics and Political Science, London WC2A 2AE
EDITOR—Nick Black's helpful letter1 raises four potential biases in my study that may affect the conclusion that fundholding reduces waiting times.2
His first point concerned the accuracy of my database. I have now made random checks of patients' details at general practices in the catchment areas of all four providers. These confirmed the accuracy of the database.