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Reliability and validity of the Arabic translation of the palliative performance scale

Published online by Cambridge University Press:  08 November 2019

Ahmed A.M. Abdelhafeez
Affiliation:
Palliative Medicine Unit, Kasr Al-Ainy Center of Clinical Oncology and Nuclear Medicine, Kasr Al-Ainy School of Medicine, Cairo University, Cairo, Egypt
Nafie F. Makady*
Affiliation:
Clinical Oncology Department, Kasr Al-Ainy Center of Clinical Oncology and Nuclear Medicine, Kasr Al-Ainy School of Medicine, Cairo University, Cairo, Egypt
Ola Hafez
Affiliation:
Palliative Medicine Unit, Kasr Al-Ainy Center of Clinical Oncology and Nuclear Medicine, Kasr Al-Ainy School of Medicine, Cairo University, Cairo, Egypt
Catherine N. Atallah
Affiliation:
Palliative Medicine Unit, Kasr Al-Ainy Center of Clinical Oncology and Nuclear Medicine, Kasr Al-Ainy School of Medicine, Cairo University, Cairo, Egypt
Samy A. Alsirafy
Affiliation:
Palliative Medicine Unit, Kasr Al-Ainy Center of Clinical Oncology and Nuclear Medicine, Kasr Al-Ainy School of Medicine, Cairo University, Cairo, Egypt
*
Author for correspondence: Nafie F. Makady, Cairo University Hospitals, Alsaray St., Elmaniel, 11451 Cairo, Egypt. E-mail: dr.nafie.onco@gmail.com

Abstract

Objective

The aim of this study was to translate the Palliative Performance Scale (PPSv2) into Arabic and to test the reliability and validity of the PPS Arabic translation (PPS-Arabic).

Method

The PPSv2 was translated into Modern Standard Arabic using a forward–backward method. Inter-rater and intra-rater reliabilities were tested in a pilot study that included 20 patients. The validation study included 150 cancer patients. Patients were divided according to their treatment plan into three groups (in-remission, palliative chemotherapy, and best supportive care) to perform hypothesis-testing construct validity. Validity was further evaluated by correlating PPS-Arabic with the Karnofsky Performance Scale (KPS), the Eastern Cooperative Oncology Group (ECOG) scale, and Physical Functioning (PF2) and Role Functioning (RF2) scales of the European Organization for Research and Treatment of Cancer quality of life questionnaire (EORTC QLQ-C30).

Results

The intraclass correlation coefficients for the intra-rater and inter-rater reliability were 0.935 (95% CI: 0.88–0.965; p < 0.001) and 0.965 (95% CI: 0.934–0.981; p < 0.001), respectively. The PPS-Arabic internal consistency Cronbach's alpha was 0.986. The average PPS-Arabic score differed significantly (p < 0.001) between the three groups of patients being 89 for in-remission, 58 for palliative chemotherapy, and 38 for best supportive care. The PPS-Arabic score correlated significantly (p < 0.001) with the KPS, ECOG performance scale, and the EORTC QLQ-C30 PF2 and RF2 scales.

Conclusion

The PPS-Arabic is a reliable and valid tool for the assessment of performance status of cancer patients.

Type
Original Article
Copyright
Copyright © Cambridge University Press 2019

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