Construct validity of the Spanish version of the Post-COVID-19 Functional Status scale and validation of the web-based form in COVID-19 survivors

Cristina Sacristán-Galisteo; Tamara Del Corral; Marta Ríos-León; Patricia Martín-Casas; Gustavo Plaza-Manzano; Ibai López-de-Uralde-Villanueva

doi:10.1371/journal.pone.0269274

Construct validity of the Spanish version of the Post-COVID-19 Functional Status scale and validation of the web-based form in COVID-19 survivors

PLoS One. 2022 Jun 1;17(6):e0269274. doi: 10.1371/journal.pone.0269274. eCollection 2022.

Authors

Cristina Sacristán-Galisteo¹, Tamara Del Corral², Marta Ríos-León³, Patricia Martín-Casas², Gustavo Plaza-Manzano², Ibai López-de-Uralde-Villanueva²

Affiliations

¹ Centro de Salud Las Fronteras, Gerencia Asistencial de Atención Primaria, Madrid, Spain.
² Department of Radiology, Rehabilitation and Physiotherapy, Faculty of Nursing, Physiotherapy and Podiatry, Complutense University of Madrid, IdISSC, Madrid, Spain.
³ SESCAM, Toledo, Spain.

Abstract

Objectives: To assess the psychometric characteristics of the Spanish Post-COVID-19 Functional Status (PCFS) scale (web-based and paper-based forms) and the test-retest reliability of the web-based form.

Study design and setting: Cross-sectional study of 125 COVID-19 survivors. The test-retest reliability of the web-based form was assessed at 7 days after the first evaluation. We collected symptoms, functional status (PCFS scale), health-related quality of life (EuroQol-5D questionnaire, EQ-5D-5L), activities of daily living limitations [Barthel Index and Global Activity Limitation Index, GALI] and psychological state (Hospital Anxiety and Depression Scale, HADS).

Results: The paper- and web-based forms of the Spanish PCFS scale showed adequate construct validity, and the web-based form provided substantial test-retest reliability (kappa = 0.63). The percentage of agreement between the web-based and paper-based forms was high (88%). Functional status showed a high correlation with EQ-5D-5L (inverse) and GALI (direct) (both; Rho ≥ .743), a moderate correlation with HADS (Rho ≥ .409) and a low correlation with the Barthel Index (Rho < .30). The Kruskal-Wallis test showed statistically significant differences in EQ-5D-5L, GALI and HADS according to the degree of functional status.

Conclusion: The Spanish version of the PCFS scale (web-based and paper-based forms) showed adequate construct validity, and the web-based form provided substantial test-retest reliability in COVID-19 survivors.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Activities of Daily Living
COVID-19*
Cross-Sectional Studies
Functional Status
Humans
Internet
Quality of Life* / psychology
Reproducibility of Results
Survivors

Grants and funding

Funded by the Foundation for Biosanitary Research and Innovation in Primary Care (FIIBAP) and the Regional Ministry of Health of the Community of Madrid through non-refundable grants from the credits awarded to the Community of Madrid by the Spanish Government Fund COVID-19, included in Order HAC/667/2020.