Initiation of distress screening in oral cancer clinics in Sri Lanka.

OBJECTIVE: This paper describes the initiation of distress screening in oral cancer clinics, among patients with oral cancer in Sri Lanka, addressing the service gap of lack of psychosocial oncology services. This involved validation of the Sinhala version of the Distress Thermometer (DT) and Problem List (PL) as an adjustment disorder (AD) screening tool. METHODS: The DT and PL were translated into the Sinhala language and cross-culturally adopted by the "modified Delphi" technique. The judgment validity was obtained through face, content, and consensual validation. The criterion validation of DT was performed among 95 oral cancer patients from two oro-maxillofacial-oncological hospitals in Sri Lanka, against the AD diagnosis of two consultant psychiatrists. RESULTS: The DT and the PL revealed good judgment validity. The optimal cut-off point of DT was 4 with a sensitivity of 91.8% (95% CI = 80.8%-96.8%), specificity of 78.3% (95% CI = 64.4%-87.7%), positive predictive value of 0.81 (95% CI = 0.53%-1.1%) and negative predictive value of 0.90 (95% CI = 0.2%-1.7%). The test re-test reliability of DT was excellent (Kappa coefficient 0.894). The area under the curve was 0.843. The PL demonstrated poor internal consistency in practical problems (KD-20 = 0.4), social problems (KD-20 = 0.3) and spiritual problems (KD-20 = 0.6). CONCLUSIONS: The Sinhala version of DT and PL were deemed a valid AD screening tool for patients with oral cancer in Sri Lanka to initiate distress screening in busy oral cancer clinics. However, further validation for the full spectrum of distress is needed, preferably with improvements to PL.