Univariate and multivariate logistic regression of risk factors associated to apnoea–hypopnoea index ≥5 events·h−1
| Optimal cut-off | Crude OR | p-value | Adjusted univariate OR# | p-value | Multivariate OR# | p-value | |
| Age years | 1.026 (0.927–1.135) | 0.626 | |||||
| BMI z-score | 1.124 (0.945–1.338) | 0.186 | |||||
| Eosinophils ×103cells·µL−1 | <0.5 | 2.232 (1.003–4.966) | 0.049 | 2.277 (1.018–5.090) | 0.045 | ||
| CRP mg·dL−1 | >0.12 | 2.591 (1.127–5.957) | 0.025 | 2.891 (1.137–7.348) | 0.026 | ||
| MCHC g·dL−1 | <34.9 | 4.674 (1.357–16.095) | 0.015 | 4.640 (1.343–16.027) | 0.015 | 3.951 (1.130–13.840) | 0.032 |
| RDW % | >13.1 | 3.533 (1.403–8.896) | 0.007 | 3.635 (1.411–9.363) | 0.007 | 2.954 (1.131–7.717) | 0.027 |
Data are presented as OR (95% CI), unless otherwise stated. BMI: body mass index; CRP: C-reactive protein; MCHC: mean corpuscular haemoglobin concentration; RDW: red cell distribution width. #: adjusted by age and BMI z-score.