Table I.
Characteristics of Patients Receiving Cardiac Diagnostic and Interventional Procedures: Worcester Heart Attack Study
| Feature | Cardiac Catheterization | p-value | PCI | p-value | CABG | p-value |
|---|---|---|---|---|---|---|
| Age (years) | % receiving | % receiving | % receiving | |||
| <55 | 60.8 | <0.01 | 31.9 | <0.01 | 4.6 | <0.01 |
| 55–64 | 50.8 | 22.6 | 6.3 | |||
| 65–74 | 39.4 | 16.3 | 6.0 | |||
| 75–84 | 26.1 | 11.2 | 3.9 | |||
| ≥85 | 9.4 | 5.5 | 0.5 | |||
| Sex | ||||||
| Male | 43.0 | <0.01 | 19.5 | <0.01 | 5.3 | <0.01 |
| Female | 28.9 | 13.6 | 3.4 | |||
| Payment Method | ||||||
| Private Payment | 48.8 | 0.39 | 21.9 | <0.01 | 5.0 | <0.01 |
| Private Insurance | 47.7 | 17.2 | 3.9 | |||
| Blue Cross | 42.7 | 18.8 | 3.4 | |||
| Medicaid | 44.7 | 19.7 | 5.7 | |||
| Medicare | 26.6 | 10.4 | 3.3 | |||
| HMO | 49.5 | 26.7 | 6.8 | |||
| Prehospital Delay | ||||||
| <2 hrs | 44.0 | <0.01 | 21.7 | <0.01 | 4.2 | .08 |
| 2–3.9 hrs | 42.2 | 17.0 | 5.7 | |||
| 4–5.9 hrs | 40.0 | 18.0 | 4.0 | |||
| ≥6 hrs | 38.0 | 14.7 | 5.7 | |||
| Body Mass Index | ||||||
| <25 | 35.9 | <0.01 | 19.0 | <0.01 | 4.5 | <0.01 |
| 25–29.9 | 55.1 | 30.3 | 6.8 | |||
| ≥30 | 61.1 | 34.7 | 8.5 | |||
| Comorbidities | ||||||
| Angina | ||||||
| Yes | 38.2 | 0.18 | 15.4 | <0.05 | 6.8 | <0.01 |
| No | 36.7 | 17.5 | 3.8 | |||
| Diabetes | ||||||
| Yes | 35.5 | <0.05 | 14.1 | <0.01 | 6.0 | <0.01 |
| No | 37.7 | 18.1 | 3.9 | |||
| Heart Failure | ||||||
| Yes | 19.2 | <0.01 | 7.7 | <0.01 | 2.5 | <0.01 |
| No | 41.5 | 19.2 | 5.0 | |||
| Stroke | ||||||
| Yes | 23.7 | <0.01 | 10.0 | <0.01 | 2.9 | <0.01 |
| No | 38.7 | 17.8 | 4.7 | |||
| Hypertension | ||||||
| Yes | 37.6 | 0.21 | 16.9 | 0.79 | 5.2 | <0.01 |
| No | 36.3 | 17.1 | 3.5 | |||
| MI Order | ||||||
| Initial | 39.3 | <0.01 | 19.3 | <0.01 | 4.7 | 0.32 |
| Prior | 33.0 | 12.6 | 4.2 | |||
| MI Type | ||||||
| Q wave | 40.4 | <0.01 | 20.7 | <0.01 | 4.1 | 0.12 |
| Non Q wave | 35.2 | 14.9 | 4.8 |