Table 3.
Cumulative Incidence of Readmission at 30 Days After Incident MI Discharge According to Baseline/Incident MI Characteristics
| Characteristic | Hazard Ratio (95% CI) |
Cumulative Incidence (95% CI) |
|
|---|---|---|---|
| Age (years) | |||
| <60 | 1 (referent) | 19.1 (16.0–22.3) | |
| 60–79 | 0.90 (0.71–1.14) | 17.4 (15.5–19.4) | |
| ≥80 | 1.07 (0.80–1.42) | 19.9 (16.9–22.8) | |
| Sex | |||
| Female | 1 (referent) | 20.2 (18.0–22.4) | |
| Male | 0.83 (0.69–1.00) | 17.2 (15.4–19.1) | |
| Hypertension | |||
| No | 1 (referent) | 17.1 (14.7–19.5) | |
| Yes | 1.15 (0.94–1.40) | 19.3 (17.5–21.1) | |
| Diabetes mellitus | |||
| No | 1 (referent) | 17.3 (15.8–18.8) | |
| Yes | 1.34 (1.10–1.63) | 22.6 (19.5–25.6) | |
| Chronic obstructive pulmonary disease | |||
| No | 1 (referent) | 17.6 (16.2–19.0) | |
| Yes | 1.43 (1.15–1.79) | 23.9 (19.9–27.9) | |
| Current smoker | |||
| No | 1 (referent) | 18.2 (16.7–19.7) | |
| Yes | 1.11 (0.89–1.39) | 19.7 (16.4–22.9) | |
| Cerebrovascular Disease | |||
| No | 1 (referent) | 18.4 (16.9–19.9) | |
| Yes | 1.04 (0.83–1.30) | 19.2 (15.8–22.5) | |
| Heart failure | |||
| No | 1 (referent) | 18.3 (16.8–19.8) | |
| Yes | 1.12 (0.87–1.43) | 20.0 (16.2–23.7) | |
| Body mass index (kg/m2) | |||
| <20 | 1.03 (0.70–1.52) | 18.4 (12.9–23.9) | |
| 20 to 24.9 | 1.19 (0.94–1.50) | 20.1 (17.4–22.9) | |
| 25 to 29.9 | 1.07 (0.87–1.32) | 18.5 (16.2–20.8) | |
| ≥30 | 1 (referent) | 17.3 (14.9–19.7) | |
| Type of myocardial infarction | |||
| ST-segment elevation | 0.87 (0.71–1.06) | 17.1 (14.6–19.5) | |
| Non ST-segment elevation | 1 (referent) | 19.2 (17.5–20.9) | |
| Killip class | |||
| 1 | 1 (referent) | 17.6 (16.0–19.3) | |
| 2–4 | 1.22 (1.01–1.46) | 20.5 (17.9–23.0) | |
| Angiography/ Reperfusion/revascularization | |||
| Reperfusion/revascularization no complications | 1 (referent) | 16.8 (14.8–18.7) | |
| Angiogram no complications | 1.13 (0.91–1.40) | 16.3 (12.8–19.8) | |
| No angiogram/reperfusion/revascularization | 1.17 (0.92–1.48) | 18.7 (15.7–21.8) | |
| Angiogram with complications | 2.40 (1.43–4.01) | 35.3 (21.6–49.0) | |
| Reperfusion/ revascularization with complications | 2.12 (1.61–2.80) | 31.6 (25.4–37.9) | |
| Anemia* | |||
| No | 1 (referent) | 20.9 (18.3–23.6) | |
| Yes | 1.26 (1.03–1.50) | 17.4 (15.8–19.1) | |
| Estimated glomerular filtration rate (mL/min)* | |||
| ≥60 | 1 (referent) | 17.5 (15.4–19.6) | |
| <60 | 1.13 (0.93–1.37) | 19.4 (17.4–21.3) | |
| Length of stay during incident MI admission (days) | |||
| 0–3 | 1 (referent) | 14.4 (11.8–17.0) | |
| 4–7 | 1.34 (1.05–1.70) | 18.5 (16.4–21.7) | |
| >7 | 1.65 (1.27–2.14) | 22.0 (19.3–24.7) | |
| Year of diagnosis | |||
| 1987–92 | 1 (referent) | 18.6 (15.6–21.7) | |
| 1993–98 | 1.03 (0.80–1.33) | 18.7 (15.8–21.5) | |
| 1999–2004 | 1.02 (0.79–1.32) | 18.8 (16.2–21.3) | |
| 2005–10 | 0.98 (0.74–1.29) | 18.1 (15.3–20.9) | |
The estimated cumulative incidence and 95% CI of readmission at 30 days for each characteristic are adjusted for all other variables shown as well as site of care. CI= confidence interval
*
Anemia and estimated glomerular filtration rate are based on hemoglobin and creatinine from laboratory measurements on the index MI date or the closest date when measured during the index admission.