Figure 1.

Correlation between polysomnographic parameters and MFIS² values.

Notes: Correlations between MFIS 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 number of awakenings and high MFIS values. Note the higher amount of deep sleep in treated SRBD patients, which seems not to have an impact on MFIS or FSS values. It must also be pointed out that PLMD/RLS patients showed a high number of awakenings.

Abbreviations: AHI, apnea/hypopnea index; MFIS, Modified Fatigue Impact Scale; 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.