Table 8

Results of multiple logistic regression analysis (adjusted) with the variables in the left column retained in the final regression (all other variables not significant)

Variables	β	SE	Wald	Adjusted OR (95% CI)	p Value
SpO₂ ≤85%
Non-smoking	−0.048	0.481	14.12	2.343 (2.121 to 2.895)	0.001
Smoking	−0.062	0.474	15.86	2.584 (1.984 to 3.365)	0.001
Smoking
No smoking
<1 pack/day	0.084	0.382	3.84	0.865 (0.583 to 1.014)	0.075
1 pack/day	−0.051	0.257	4.17	0.662 (0.424 to 0.898)	0.031
>1 pack/day	−0.056	0.236	4.28	0.646 (0.328 to 0.856)	0.020
Smoking history
No smoking
Short term	−0.086	0.408	3.86	0.748 (0.482 to 1.083)	0.057
Medium term	−0.068	0.252	4.04	0.674 (0.412 to 0.767)	0.027
Long term	−0.082	0.186	4.16	0.636 (0.318 to 0.825)	0.021

SpO₂, arterial oxygen saturation.