Table 3.
Missing comorbidity data
| Comorbidity variable | Number of missing values | Percent missing |
|---|---|---|
| Diabetes | 0 | 0 |
| Current smoker | 0 | 0 |
| Former smoker | 63,540 | 72 |
| Alcohol | 57,984 | 66 |
| Current pneumonia | 57,984 | 66 |
| Ascites | 0 | 0 |
| Esophageal varices | 57,984 | 66 |
| CHF | 0 | 0 |
| History of MI | 57,984 | 66 |
| Previous PCI | 57,984 | 66 |
| Previous cardiac surgery | 57,984 | 66 |
| Angina | 57,984 | 66 |
| Hypertension | 0 | 0 |
| Peripheral vascular disease | 57,984 | 66 |
| Rest pain | 57,984 | 66 |
| Renal failure | 0 | 0 |
| Dialysis | 0 | 0 |
| Impaired sensorium | 57,984 | 66 |
| Coma > 24 hours | 57,984 | 66 |
| Hemiplegia | 57,984 | 66 |
| History of TIA | 57,984 | 66 |
| Stroke with neurologic deficit | 57,984 | 66 |
| Stroke without neurologic deficit | 57,984 | 66 |
| CNS tumor | 57,984 | 66 |
| Paraplegia | 57,984 | 66 |
| Quadriplegia | 57,984 | 66 |
| Disseminated cancer | 0 | 0 |
| Wound infection | 0 | 0 |
| Steroid use | 0 | 0 |
| Weight loss | 0 | 0 |
| Bleeding disorder | 0 | 0 |
| Preoperative blood transfusion | 0 | 0 |
| Chemotherapy | 57,984 | 66 |
| Radiotherapy | 57,984 | 66 |
| Pregnancy | 58,214 | 66 |
| Prior operation within 30 days | 57,984 | 66 |
Total number of patients = 88,471; CHF = congestive heart failure; MI = myocardial infarction; PCI = percutaneous coronary intervention; TIA = transient ischemic attack; CNS = central nervous system.