Figure 2.

Correlation between polysomnographic parameters and FSS⁴ values.

Notes: Correlations between FSS and (A) arousal; (B) awakenings; (C) AHI; (D) sleep efficacy; (E) SpO2% min; (F) NREM-3/4; and (G) sleep latency. The scatter plots show a correlation between a high arousal-index and high FSS values.

Abbreviations: AHI, apnea/hypopnea index; MS, multiple sclerosis; NREM-3/4, non-rapid eye movement sleep stage 3/4; PLMD, periodic limb movement disorder; RLS, restless legs syndrome; SpO2% min, minimal desaturation; SRBD, sleep-related breathing disorder; TiB, time in bed; TST, total sleep time; FSS, Fatigue Severity Scale.