family members; neurology; quality of life; reliability; validity

Aim. The aim of the research was to validate the Quality of Life Questionnaire for family members of patients with progressive neurological disease PNDQoL_FM. Material and methods. To analyze the psychometric properties of the questionnaire, a confirmatory factor analysis (convergent validity of the questionnaire) was used, together with internal consistency of the scales (reliability), retest reliability, and correlation analysis. The research sample comprised of 157 family members of patients with PND. Results. The psychometric properties of the PNDQoL_FM questionnaire were found satisfactory. The best concordance of a model and the data (CFI: 0.989; TLI: 0.973; RMSEA: 0.063; SRMR: 0.030; GFI: 0.977) was found for the model 2, where four domains of the functional scale were tested, i.e. activities of daily living, emotional functioning, social functioning, and spiritual area. The reliability of the individual subscales was also found satisfactory (Cronbach α: 0.735-0.923). The retest reliability was determined to be satisfactory for all domains as well (r>0.7). Conclusions. The questionnaire PNDQoL_FM could be used for both research and clinical practice. The assessment of the quality of life of the PND patients' family members may be a convenient indicator of the quality of provided care. © 2022 Radka Bugová et al., published by Sciendo.