Patient-reported outcome measures in early psychosis: Evaluating the psychometric properties of the single-item self-reported health and self-reported mental health measures in Chennai, India and Montreal, Canada.

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Patient-reported outcome measures (PROMs) provide valuable information and promote shared decision-making but are infrequently used in psychosis. Self-rated Health (SRH) and Self-rated Mental Health (SRMH) are single-item PROMs in which respondents rate their health and mental health from 'poor' to 'excellent'. We examined the psychometric properties of the SRH and SRMH in early psychosis services in Chennai, India and Montreal, Canada. Assessments were completed in Tamil/English in Chennai and French/English in Montreal. Test-retest reliability included data from 59 patients in Chennai and Montreal. Criterion validity was examined against clinician-rated measures of depression, anxiety, positive and negative symptoms, and a quality-of-life PROM for 261 patients in Chennai and Montreal. SRH and SRMH had good to excellent test-retest reliability (ICC >0.63) at both sites and in English and Tamil (but not French). Results for criterion validity were mixed. In Montreal, low SRH was associated with not being in positive symptom remission, and poorer functioning and quality of life. SRH was associated only with functioning in Chennai. No associations were found for SRMH in Montreal. In Chennai, low SRMH was associated with not being in positive symptom remission and poorer functioning. Patient-reported outcome measures may perform differently across contexts as a potential function of variations in sociodemographics, illness characteristics/course, understandings of health/mental health, and so forth. More work is needed to understand if discrepancies between PROMs and CROMs indicate poor validity of PROMs or 'valid' differences between patient and clinician perceptions. Our work suggests that single-item PROMs can be feasibly integrated into clinical settings.