Table 4. Possible risk factors for hypoxemia during endoscopic procedures: Univariant analysis (Continued).
| Variables (categorical) | Subvariables | No hypoxemia (n = 4659) | Hypoxemia (n = 245) | P value |
| Gender | 0.4292 | |||
| Male | 2136 (45.8%) | 106 (43.3%) | ||
| Female | 2523 (54.2%) | 139 (56.7%) | ||
| Alcohol | 0.3668 | |||
| No | 3432 (73.7%) | 187 (76.3%) | ||
| Yes | 1223 (26.3%) | 58 (23.7%) | ||
| Allergy | 0.03498 | |||
| No | 3538 (93.7%) | 188 (89.5%) | ||
| Yes | 237 (6.3%) | 22 (10.5%) | ||
| Endoscopy | 0.03048 | |||
| EGD | 3708 (79.6%) | 194 (79.2%) | ||
| Colonoscopy | 933 (20%) | 47 (19.2%) | ||
| EGD+colonoscopy | 15 (0.3%) | 4 (1.6%) | ||
| ASA scores | 0.0005 | |||
| I | 1145 (27.7%) | 44 (18.6%) | ||
| II | 2238 (54.1%) | 126 (53.2%) | ||
| III | 693 (16.8%) | 63 (26.6%) | ||
| IV | 59 (1.4%) | 4 (1.7%) | ||
| Lung diseases | 0.0065 | |||
| No | 4306 (92.8%) | 212 (86.9%) | ||
| COPD | 40 (0.9%) | 5 (2.0%) | ||
| Chronic bronchitis | 141 (3.0%) | 12 (4.9%) | ||
| Pulmonary emphysema | 24 (0.5%) | 3 (1.2%) | ||
| Asthma | 84 (1.8%) | 10 (4.1%) | ||
| Others | 43 (0.9%) | 2 (0.8%) | ||
| Other preexisting diseases | 0.0005 | |||
| No | 2038 (52.3%) | 65 (32.3%) | ||
| Hypertension | 572 (14.7%) | 43 (21.4%) | ||
| Diabetes | 151 (3.9%) | 14 (7.0%) | ||
| CHF | 99 (2.5%) | 9 (4.5%) | ||
| Stroke | 47 (1.2%) | 3 (1.5%) | ||
| Liver cirrhosis | 73 (1.9%) | 6 (3.0%) | ||
| GI diseases | 683 (17.5%) | 45 (22.4%) | ||
| Cancer | 65 (1.7%) | 3 (1.5%) | ||
| Heart diseases | 169 (4.3%) | 13 (6.5%) |
CHF Chronic Heart Failure, COPD Chronic Obstructive Pulmonary Disease, EGD Esophagogastroduodenoscopy, GI gastrointestinal.
n (%) are presented in the table.