Page 60 - Development of Questionnaires for Quantitative Medical Research

for this measurement (i.e. structured interview to

diagnose depression or PSG machine to diagnose

OSA) since it is often very unlikely for the

performance of a ‘screening’ questionnaire to be

as good as the gold standard in the detection of the

event of interest (i.e. depression or OSA).

However, this type of questionnaire will be

developed with an intention to screen for a medical

condition in the study subjects which can also be

used as preliminary evaluation to rule out the ‘non-

disease’ cases. This is a useful approach for

minimizing the overall cost of performing a

diagnosis and screening for a medical condition in