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Patient interpretation of the Patient-Generated Subjective Global Assessment (PG-SGA) Short Form

Authors Balstad TR, Bye A, Jenssen CRS, Solheim TS, Thoresen L, Sand K

Received 11 February 2019

Accepted for publication 2 May 2019

Published 16 August 2019 Volume 2019:13 Pages 1391—1400

DOI https://doi.org/10.2147/PPA.S204188

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Colin Mak

Peer reviewer comments 2

Editor who approved publication: Dr Johnny Chen


Trude R Balstad,1,2 Asta Bye,3,4 Cathrine RS Jenssen,1 Tora S Solheim,1,2 Lene Thoresen,2,5 Kari Sand1,2,6

1Department of Clinical and Molecular Medicine, Faculty of Medicine and Health Sciences, NTNU, Norwegian University of Science and Technology, Trondheim, Norway; 2Cancer Clinic, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway; 3Department of Nursing and Health Promotion, Faculty of Health Sciences, OsloMet – Oslo Metropolitan University, Oslo, Norway; 4European Palliative Care Research Centre (PRC), Department of Oncology, Oslo University Hospital and Institute of Clinical Medicine, University of Oslo, Oslo, Norway; 5National Advisory Unit on Disease-related Malnutrition, Oslo University Hospital, Oslo, Norway; 6SINTEF Digital, Department of Health Research, Trondheim, Norway

Correspondence: Trude R Balstad
Department of Clinical and Molecular Medicine, Faculty of Medicine and Health Sciences, NTNU – Norwegian University of Science and Technology, Postbox 8905, Trondheim 7491, Norway
Tel +47 7 282 6060
Email trude.r.balstad@ntnu.no

Background: The Patient-Generated Subjective Global Assessment (PG-SGA) is a patient-reported instrument for assessment of nutrition status in patients with cancer. Despite thorough validation of PG-SGA, little has been reported about the way patients perceive, interpret, and respond to PG-SGA. The aim of this study was to investigate how patients interpret the patient-generated part of the PG-SGA, called PG-SGA Short Form.
Methods: Purposive sampling was used to identify participants that had experienced weight loss and/or reduced dietary intake and/or had a low body mass index. Data were collected from 23 patients by combining observations of patients filling in the PG-SGA Short Form, think-aloud technique and structured interviews, and analyzed qualitatively using systematic text condensation.
Results: Most of the participants managed to complete the PG-SGA Short Form without problems. However, participant-related and questionnaire-related sources of misinterpretation were identified, possibly causing misinterpretations or wrong/missing answers. Participants either read too fast and skipped words, or they struggled to find response options that were suitable for covering their entire situation perfectly. The word “normal” was perceived ambiguous, and the word “only” limited the participants’ possibility to accurately describe their food intake. Long recall periods in the questions and two-pieced response options made it difficult for patients to select only one option.
Conclusion: The results of this study provide a unique patient perspective of using the PG-SGA Short Form and valuable input for future use and revisions of the form. The identified sources of misunderstanding could be used to develop a standardized instruction manual for patients and health care personnel using the PG-SGA Short Form.

Keywords: validation studies, PG-SGA, qualitative research, patient involvement, patient-reported outcome measures


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