Table 3.
Factors associated with arterial oxygen saturation (SpO2) decrease in multivariable logistic regression
| OR | 95% CI | P-value | |
|---|---|---|---|
| Sex | |||
| Male | 1.68 | 1.15–2.45 | 0.008 |
| Age (years) | 1.03 | 1.01–1.06 | 0.008 |
| Smoking history | |||
| Never smoking | 1 | ||
| Former smoking | |||
| <10 pack-years | 1.14 | 0.62–2.09 | 0.7 |
| ≥10 pack-years | 1.74 | 1.04–2.92 | 0.035 |
| Smoking | |||
| <10 pack-years | 0.71 | 0.17–3.04 | 0.6 |
| ≥10 pack-years | 2.48 | 1.48–4.15 | 0.001 |
| BMI (kg/m2) | |||
| <30 | 1 | ||
| ≥30 | 1.72 | 1.15–2.57 | 0.008 |
| FEV1 % predicted | |||
| ≥80 | 1 | ||
| 50–80 | 1.18 | 0.79–1.75 | 0.4 |
| >50 | 3.55 | 1.60–7.89 | 0.002 |
| CRP (mg/L) | |||
| ≥5 | 1.74 | 1.12–2.71 | 0.013 |
Notes: N=2,682 subjects. Pack-years were obtained by multiplying the average number of cigarettes smoked daily by the number of years smoked and dividing the product by 20.
Abbreviations: BMI, body mass index; CI, confidence interval; CRP, C-reactive protein; FEV1, forced expiratory volume in 1 second; OR, odds ratio.