Table 2—

Relationships between sleep-disordered breathing parameters and catecholamines in urine in simple linear regression analysis

AHIDIMin Sa,O2Average Sa,O2Snoring index
U‐norepinephrine µmol·mol−10.090.08−0.13−0.19*0.004
U‐normetanephrine µmol·mol−10.33***0.34***−0.29**−0.29**−0.02
U‐MHMA mmol·mol−1−0.01−0.030.090.09−0.19*
U‐metanephrine µmol·mol−10.150.16−0.05−0.06−0.16
U‐mettyramine µmol·mol−10.070.05−0.09−0.180.10
  • Data are presented as standard coefficient of regression (r)

  • AHI: apnoea-hypopnoea index

  • DI: desaturation index

  • Min Sa,O2: minimum arterial oxygen saturation during night

  • Average Sa,O2: average arterial oxygen saturation during night

  • U: urinary

  • MHMA: methoxy-hydroxy-mandelic acid

  • Catecholamines were measured per mol of creatinine

  • *: p<0.05

  • **: p<0.01

  • ***: p<0.001