Table 2

Pearson correlation for RRDI (at 90% threshold)

Correlation coefficientsP value
AHI 4%0.18<0.0001
PLMI0.19<0.0001
Respiratory arousal index0.24<0.0001
Leg movement arousal index0.23<0.0001
Spontaneous arousal index−0.090.127

  • AHI 4%, apnoea–hypopnoea index based on hypopnoea associated with 4% desaturation; PLMI, periodic legs movement index; RRDI, R-R interval dips index.