The validity and reliability of the WHO Schedules for Clinical Assessment in Neuropsychiatry (SCAN Thai Version): anxiety disorders section.
BACKGROUND
Anxiety disorders are some of the most prevalent psychiatric disorders, have early onset, are chronic and can cause functional impairment. It is, therefore, crucial to establish an accurate diagnosis for treatment and research purposes.


OBJECTIVE
To test the validity and reliability of the W.H.O. Schedules for Clinical Assessment in Neuropsychiatry (SCAN Thai Version): Anxiety Disorders Section.


METHODS
The linguistic clarity of the psychiatric schedules for Thais was tested by psychiatrists from the country's four regions. The psychiatrists were competent in the use of the schedules and their underlying objectives. Then between October 2004 and August 2005, Reliability of SCAN: anxiety disorder section was tested among 30 participants, including patients with anxiety disorders and normal volunteers.


RESULTS
Based on reactions from Thais and consultations from competent psychiatrists, content validity was established. The duration of interviews for anxiety disorders section averaged 45.1 min (SD = 13.5). The reliability determined by Cohen's kappa coefficient for the 83 items that related to anxiety disorders in the SCAN were in Section 3, 4, 5. This overall inter-rater reliability was 0.79 (SD = 0.22), which were in substantial level of agreement. The overall intra-rater reliability was rated by the same psychiatrist 2 weeks apart. The result was 0.84 (SD = 0.21), which was near perfect agreement. There were three items (3.6%) of fair agreement and five items (6%) of moderate agreement that were caused from discrepancy of item definitions and the subjectivity of raters.


CONCLUSIONS
The Anxiety Disorders Sections of the WHO Schedules for Clinical Assessment in Neuropsychiatry (SCAN Thai Version) were an effective tool for assessing symptoms of anxiety disorders among Thais.
Krisanaprakornkit
Thawatchai
T
Department of Psychiatry, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand. drthawatchai@yahoo.com
Rangseekajee
Poonsri
P
Paholpak
Suchat
S
Khiewyoo
Jiraporn
J
D001008:Anxiety Disorders / Q000175:diagnosis* / Q000523:psychology; D006801:Humans; D007407:Interviews as Topic; D009483:Neuropsychological Tests / Q000592:standards*; D016584:Panic Disorder / Q000175:diagnosis* / Q000523:psychology; D010698:Phobic Disorders / Q000175:diagnosis* / Q000523:psychology; D011569:Psychiatric Status Rating Scales; D011570:Psychiatry / Q000379:methods* / Q000592:standards; D013785:Thailand; D014944:World Health Organization