Table 1– Anthropometric and sleep characteristics of the sample
All patientsMalesFemales
Subjects n529424105
Age yrs51.3±12.850.9±13.052.9±12.0
Diabetes mellitus17.016.519
BMI kg·m−230.8±6.030.6±5.431.6±7.9
Neck circumference cm41.6±4.142.7±3.537.3±3.8***
AHI events·h−143.4±27.644.8±26.737.7±30.7+
ArI events·h−151.5±23.252.4±22.647.8±25.3
Mean nocturnal Sa,O2 %92.3±4.092.1±4.093.0±4.0
Lowest Sa,O2 %80.8±9.380.5±9.381.6±9.4
ESS score9.7±5.19.8±5.09.5±5.5
Daytime sleepiness51.851.453.3
Diagnosis of metabolic syndrome51.251.450.5
High blood pressure54.655.451.4
High waist circumference7270.877.1
Low HDL cholesterol26.826.727.6
High triglyceride level45.947.639
High fasting blood glucose49.950.746.7
  • Data are presented as mean±sd or %, unless otherwise stated. BMI: body mass index; AHI: apnoea/hypopnoea index; ArI: arousal index; Sa,O2: arterial oxygen saturation; ESS: Epworth Sleepiness Scale; HDL: high-density lipoprotein. #: BMI ≥30 kg·m−2; : ESS ≥10. ***: p<0.001; +: p=0.02 for difference between sexes by unpaired t-test or Chi-squared analysis.