The objective of this study was to validity for suicidal risk screening test.
Descriptive study of 4 phase; phase 1) the study of content validity by conducting three meetings of experts to develop the draft of the screening test and tried out with 10 focus groups from 5 regions of the country. Phase 2) includes item analysis, discriminative power, factor analysis and concurrent validity. 131 subject were interviewed by the10 item screening test. The Thai Mini International Neuropsychiatric Interview (MINI) was used by the psychiatrists to analyze the suicidal risk. Phase 3) includes the agreement study between the diagnosis of the two psychiatrists. 36 out-patients were selected. Each individual had to see two psychiatrists one by one. The psychiatrists didn't know the history of the patient. Phase 4) includes the validity study of the instrument, conducted by collecting the data from the 715 people residing at Ta Kraserm Sub-district, Namphong District, KhonKaen. Each subject was interviewed with the screening test. Each with 1 point up needs to see the psychiatrists. But only 30% of the participants who get 0 point would be randomly selected to see the psychiatrists. The data were collected from June 2003. The data were then analyzed by using the descriptive statistics, sensitivity, specificity, PPV, NPV accuracy, prevalence ect.
1.) The screening test contains 3 components including 1)Suicidal intention 2) Severe stress 3) Medical component. There are 10 items. Cronbach's alpha coefficient is 0.719. The discriminative power between the normal people and the person with suicidal risk is significantly different at p<0.001. 2.) The agreement study of the two psychiatrists Kappa Statistics is 0.788 (p<0.001) 3.) The validity of suicidal risk screening test in community; the proper cut off point = 2, with sensitivity = 84.2%, specificity = 88.0%, positive predictive value = 28.3%, negative predictive value = 99.0%, the accuracy of test = 87.8%. prevalence of suicidal risk in community = 5.3%.
The test can be used to screen the persons under suicidal risk. It is convenient and easy to be applied in any community settings so that the public health personnel con prevent the risky person at the early stage.