The GAD-7 showed good reliability and criterion, construct, factorial, and procedural validity in a study carried out in 15 primary care clinics [ 21].
The GAD-7 has been found to demonstrate good reliability as well as convergent (with worry, anxiety, low mood and stress), criterion, construct, factorial, and procedural validity [ 36, 37].
The PHQ-9 is based on the DSM-IV diagnostic criteria for major depressive disorder and has excellent reliability, as well as criterion, construct, factorial and procedural validity.
The GAD-7 is based on the most prominent diagnostic features of the DSM-IV diagnostic criteria for generalized anxiety disorder and has excellent reliability, as well as criterion, construct, factorial, and procedural validity.
It has good reliability as well as criterion, construct, factorial, and procedural validity [ 42, 45].
There is evidence that the GAD-7 has good reliability as well as criterion, construct, factorial and procedural validity [ 53].
To ensure reliability and validity of the study, several strategies were implemented: (1) triangulation of data collection through three IDIs and three FGDs, (2) self-reflectivity and peer review or debriefing, (3) procedural validity through proper interview technique, and (4) cross-checking of the coding process in the thematic analysis.
Procedural validity speaks only of the evaluation procedure and not to the validity of the construct itself, and is defined as the extent to which a new diagnostic procedure yields results similar to the results of an established diagnostic procedure that is used as a criterion [ 28].
We evaluated the procedural validity of the Alcohol Use Disorder and Associated Disabilities Interview Schedule, DSM-5 Version (AUDADIS-5) assessment of these disorders through clinician re-interviews.
Moreover, the agreement of experienced and inexperienced raters supports the "procedural validity" of INTERMED.
