Table 3 Multiple linear regression analyses showing the association between polysomnography and echocardiography parameters after adjustment for age, gender and body mass index z score
VariableLog transformed AHILog transformed ODI
β (95% CI)p Valueβ (95% CI)p Value
Right ventricle
    Systolic volume index1.6 (0.8 to 2.5)0.00021.2 (0.2 to 2.1)0.017
    Ejection fraction−2.7 (−4.0 to −1.3)0.0001−2.0 (−3.5 to −0.5)0.009
    Myocardial performance index0.033 (0.021 to 0.046)<0.00010.025 (0.011 to 0.040)0.0007
Left ventricle
    Left ventricular mass index0.31 (−0.78 to 1.39)NS0.62 (−0.54 to 1.78)NS
    Relative wall thickness0.003 (−0.006 to 0.011)NS0.006 (−0.003 to 0.015)NS
    Interventricular septal thickness index0.007 (−0.004 to 0.018)NS0.015 (0.003 to 0.026)0.016
    E/e′0.21 (0 to 0.42)0.050.17 (−0.05 to 0.40)NS
  • AHI, apnoea–hypopnoea index; E/e′, ratio of mitral early peak velocity/mitral annulus early peak velocity; ODI, oxygen desaturation index.