The Psychometric Properties of the Positive Emotion Rating Scale – Chinese Version (PERS-C)

Ng CG, Chong SH


Introduction: Positive emotions in depressed patients are always disregarded and overlooked due to the inadequacy of assessment tool. There is a newly developed self-report scale, yet has good psychometric properties named Positive Emotion Rating Scale (PERS). Objective: The aim of this study were to translate and examine the psychometric properties of the Chinese version PERS (PERS-C).

Method: This is a cross-sectional study involved 52 depressed and 106 control subject. Both groups were assessed with PERS-C, original PERS, Malay version of Snaith-Hamilton Pleasure Scale (SHAPS-M) and Malay version of Center for Epidemiological Studies Depression (CESD-M).

Results: PERS-C displayed good internal consistency (Cronbach’s α = 0.91) and parallel reliability with PERS (r = 0.95, p<0.01). It was negatively correlated with CES-D (r= - 0.43, p<0.01) and positively correlated with SHAPS-M (r = 0.73, p<0.01). The optimal cut-off value was 32, with sensitivity = 0.64 and specificity = 0.67, positive predictive value of 0.80 and negative predictive value of 0.48. The area under the curve (AUC) for receiver operating characteristic (ROC) was 0.71 (95% CI = 0.65 - 0.80).

Conclusion: The PERS-C is a simple and easy-to-use tool to measure positive emotion for Chinese speaking subjects, with demonstrable satisfactory psychometric properties.

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Depression; Instrument; Positive Emotion; Psychometric Properties

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