Sleep quality is associated with Disability and Quality of life in breast cancer survivors: a cross-sectional pilot study

Purpose: To evaluate the sleep quality and its association with disability, fatigue and quality of life of breast cancer survivors.

Methods: This is a cross-sectional pilot study developed with breast cancer survivors. The data collection instruments consisted of general and clinical information on the disease and the World Health Organization Disability Assessment Schedule 2.0 (WHODAS 2.0); Pittsburgh Sleep Quality Index (PSQI); Functional Assessment of Chronic Illness Therapy-Fatigue (FACIT-F); and Disabilities of the arm and Shoulder (DASH). Descriptive statistical analysis, correlation tests, tests for means comparison and linear regression were performed. Cohen's d analysed the effect size. The significance was set at p < 0.05.

Results: 71,9% of women had poor sleep quality. Subjective poor sleep quality was a predictor of worse scores for fatigue (p = 0.007), quality of life by FACT-G (p = 0.010) and FACIT-F (p = 0.004), the functional performance of upper limbs (p = 0.001) and disability (p = 0.003).

Conclusions: Breast cancer survivors with subjective poor sleep quality had more fatigue, less upper limb-related functional performance, more disability and worse quality of life.