How is information captured for the study?
The NWTPS is a records based study, which means that details for each individual are drawn from existing records and do not require individuals to be contacted for data or to complete a questionnaire. This approach both reduces the impact on the individual as well as reducing any risk of bias in response from study subjects. This does help to assure that any findings are not affected by that particular bias. The published NWTPS reports include more detail about data collection.
