Pilot testing, validity, and reliability testing were conducted in the Mitiyana hospital Mildmay HIV clinic, the site of subsequent research using the screening instruments.
Following the pilot, extensive validity and reliability testing will be undertaken and reported, drawing on data specifically obtained to investigate internal consistency and test-retest reliability, as well as various facets of validity, especially construct and predictive validity.
Instruments were tested during the intervention pilot, reliability and validity were determined and instruments were revised prior to the main trial intervention.
A small validity pilot was conducted to test the readability and usability of the CAT for staff and carers with eight health professionals from community healthcare trusts, an adult hospice and a tertiary cancer centre and seven family carers.
Themes for new items were devised from focus groups, and despite good face and content validity, pilot testing results identified that the new items did not perform well when compared in terms of their psychometric properties alongside original items.
Face validity, pilot testing and analysis/comparison of qualitative data from a sub-sample of the young people who completed the survey increased confidence among the team that the survey findings were a valid reflection of the actual experiences of the young people in the study.
The questionnaire was pilot-tested for validity among a group of health workers not involved in the study.
The questionnaire was piloted for face validity by staff and patients at the King's College London Dental Institute, which has a patient population similar to the study sample.
The questions were developed from the BIBS study evidence syntheses, service-user involvement, qualitative interviews and piloted for face validity with the target populations.
Necessary amendments were made, and prior to the survey, the audit and evaluation tool was piloted for face validity and feedback obtained on style, format and content.
