Table 7. Independent risk factors for hypoxemia with excluding pre-existing diseases.
| Variables | Subvariable | Odd ratio | 95% CI | P value |
| Age | 0.99 | 0.78–1.26 | 0.1716 | |
| BMI | 1.24 | 1.03–1.50 | 0.0017 | |
| Midazolam | 0.84 | 0.65–1.08 | 0.2140 | |
| Propofol | 0.84 | 0.66–1.06 | 0.2545 | |
| Gender | 0.8503 | |||
| Male | 1 | Reference | ||
| Female | 1.03 | 0.77–1.37 | ||
| Alcohol | 0.5877 | |||
| No | 1 | Reference | ||
| Yes | 0.91 | 0.65–1.28 | ||
| Allergy | 0.1480 | |||
| No | 1 | Reference | ||
| Yes | 1.41 | 0.88–2.26 | ||
| Endoscopy | 0.0331 | |||
| EGD | 1 | Reference | ||
| Colonoscopy | 0.98 | 0.71–1.37 | ||
| EGD+colonoscopy | 4.56 | 1.45–14.33 | ||
| ASA scores | 0.0419 | |||
| I | 1 | Reference | ||
| II | 1.38 | 0.94–2.02 | ||
| III | 1.95 | 1.23–3.10 | ||
| IV | 1.51 | 0.51–4.50 | ||
| Lung diseases | 0.3699 | |||
| No | 1 | Reference | ||
| COPD | 1.68 | 0.63–4.48 | ||
| Chronic bronchitis | 1.48 | 0.79–2.76 | ||
| Pulmonary emphysema | 1.84 | 0.53–6.42 | ||
| Asthma | 1.79 | 0.89–3.59 | ||
| Others | 0.95 | 0.22–4.06 |
BMI Body Mass Index, CHF Chronic Heart Failure, COPD Chronic Obstructive Pulmonary Disease, EGD Esophagogastroduodenoscopy.