With the exception of the BDI-II (which is self-report) the questionnaire was administered by the interviewers.
Much of the data is self reported, and so it may be subject to recall bias.
1Compensation information is self reported.
2Compensation information is self reported.
The mode of completion for all of the measures was self report.
Because this figure is self-reported by the residents, it may not be entirely accurate.
Other less frequent sources of SES information is self-report from the youth (Ensminger and Fothergill 2003).
Demographic data on the parents and the children were self reported by the parents and collected through medical record review.
Both the exposures and the outcomes were self reported; therefore, the potential that recall bias could be responsible for our positive results cannot be ignored.
The data were self reported by the proportion (61%) of UK surgeons who took part and a considerable number of surgeons did not contribute for various reasons.
