Table 3—

Cox regression: overall mortality

Variable	Original model	Added variable
		CHD history	COPD history	Sex	Smoking	AHI
Age
<50 yrs	1.00	1.00	1.00	1.00	1.00	1.00
50–60 yrs	1.50 (0.71–3.16)	1.52 (0.72–3.20)	1.50 (0.71–3.18)	1.52 (0.72–3.21)	1.58 (0.74–3.34)	1.54 (0.73–3.24)
>60 yrs	3.02 (1.41–6.48)*	2.99 (1.39–6.43)*	2.48 (1.13–5.46)*	3.29 (1.51–7.16)*	3.50 (1.61–7.59)*	3.20 (1.48–6.92)*
BMI
<28 kg·m⁻²	1.00	1.00	1.00	1.00	1.00	1.00
28–35 kg·m⁻²	1.12 (0.46–2.70)	1.13 (0.47–2.72)	1.14 (0.47–2.77)	1.11 (0.46–2.67)	1.08 (0.45–2.60)	1.09 (0.45–2.63)
>35 kg·m⁻²	1.84 (0.71–4.78)	1.89 (0.72–4.95)	1.88 (0.71–4.95)	2.02 (0.77–5.34)	2.02 (0.78–5.24)	1.77 (0.67–4.63)
AHT history
No	1.00	1.00	1.00	1.00	1.00	1.00
Yes	1.06 (0.58–1.94)	1.04 (0.56–1.91)	1.18 (0.63–2.22)	1.09 (0.59–2.00)	1.16 (0.63–2.12)	1.05 (0.57–1.93)
SAHS treatment
No	1.00	1.00	1.00	1.00	1.00	1.00
Surgery	0.15 (0.04–0.53)*	0.16 (0.04–0.54)*	0.19 (0.05–0.65)*	0.16 (0.04–0.57)*	0.17 (0.05–0.59)*	0.14 (0.04–0.50)*
Diet	0.26 (0.12–0.54)*	0.26 (0.12–0.55)*	0.28 (0.13–0.59)*	0.26 (0.12–0.54)*	0.28 (0.13–0.58)*	0.25 (0.12–0.52)*
CPAP	0.23 (0.09–0.58)*	0.23 (0.09–0.58)*	0.25 (0.10–0.62)*	0.23 (0.09–0.59)*	0.24 (0.09–0.60)*	0.22 (0.08–0.55)*
Added variable		1.00	1.00	1.00	1.00	1.00
		1.31 (0.50–3.40)	1.50 (0.71–3.13)^¶	1.51 (0.63–3.60)	2.02 (0.98–4.18)^#	0.71 (0.33–1.50)
			2.62 (1.20–5.69)*^,+

Data are presented as hazard ratio (95% confidence interval)
CHD: coronary heart disease
COPD: chronic obstructive pulmonary disease
AHI: apnoea/hypopnoea index
BMI: body mass index
AHT: arterial hypertension
SAHS: sleep apnoea/hypopnoea syndrome
CPAP: continuous positive airway pressure
*: p<0.05
^#: p<0.10 and ≥0.05. Reference categories of variables added to the original model: no CHD history, no COPD history, female sex, no smoking habit and AHI ≥30
^¶: COPD history forced expiratory volume in one second (FEV₁) ≥50%
⁺:COPD history FEV₁ <50%