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Testing the psychometric properties of the Chinese version of the Neurological Fatigue Index-Stroke
Lily Yw Ho1, Claudia Ky Lai1, Shamay Sm Ng2
1School of Nursing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR.
Objective:
To test the psychometric properties of a Chinese version of the Neurological Fatigue Index-Stroke (C-NFI-Stroke) in stroke survivors.
Design:
This was a validation study. Cross-cultural adaptation of the scale was conducted according to standard guidelines. Reliability, validity, responsiveness, and interpretability were measured.
Setting:
Self-help groups and a community center.
Subjects:
One hundred and twelve Chinese stroke survivors and 65 healthy Chinese older people living in the community.
Interventions:
Not applicable.
Main Measures:
The C-NFI-Stroke, Fatigue Severity Scale, Mental Fatigue Scale, General Self-Efficacy Scale, and Geriatric Depression Scale were used.
Results:
Cronbach's α coefficients were 0.69-0.88; the item-level agreement was 70.4%-88.9%; the weighted Kappa value was 0.47-0.79; and the intra-class correlation coefficients were 0.88-0.93. The C-NFI-Stroke had no ceiling and floor effects. It had good content validity and had two factors, "lack of energy" and "tiredness/weakness." The confirmatory factor analysis showed a good fit to the model. The C-NFI-Stroke significantly correlated with existing fatigue scales (rs = 0.55-0.63), self-efficacy (rs = -0.31 to -0.37), and depressive symptoms (rs = 0.53-0.60). The C-NFI-Stroke could discern differences between stroke survivors and healthy older people.
Conclusions:
The C-NFI-Stroke is a reliable and valid tool for clinical and research use on people who have been diagnosed with stroke for a year or more, although its factor structure differs from that of the original English version.
