Table 2.
Readmission analysis: baseline characteristics of study population, stratified by age and education
| Overall | age ≤75 | age > 75 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Level of education | Level of education | Level of education | |||||||||||||
| All | Low | Mid | High | p | All | Low | Mid | High | p | All | Low | Mid | High | p | |
| Number | 22,181 | 11,692 | 6451 | 4038 | 12,174 | 4020 | 4834 | 3320 | 10,007 | 7672 | 1617 | 718 | |||
| % | 100 | 52.7 | 29.1 | 18.2 | 100 | 33.0 | 39.7 | 27.3 | 100 | 76.7 | 16.2 | 7.2 | |||
| Demographic variables | |||||||||||||||
| Age in years | 71.2 | 77.6 | 65.2 | 62.1 | * | 61.5 | 66.5 | 59.9 | 57.9 | * | 82.9 | 83.4 | 81.4 | 81.8 | * |
| Male (%) | 64.4 | 54.1 | 73.6 | 79.5 | * | 76.2 | 68.3 | 78.6 | 82.3 | * | 50.0 | 46.6 | 58.5 | 67.0 | * |
| Clinical variables | |||||||||||||||
| Tumours (%) | 5.3 | 5.8 | 5.0 | 4.5 | * | 4.3 | 5.0 | 4.2 | 3.6 | * | 6.6 | 6.2 | 7.3 | 8.9 | * |
| Diabetes (%) | 8.4 | 10.5 | 7.3 | 4.2 | * | 6.0 | 8.7 | 5.7 | 3.2 | * | 11.3 | 11.4 | 12.2 | 8.6 | |
| Hematologic diseases (%) | 6.4 | 8.7 | 4.4 | 3.0 | * | 2.8 | 3.8 | 2.6 | 2.0 | * | 10.8 | 11.2 | 9.9 | 7.5 | * |
| Hypertensive diseases (%) | 14.0 | 17.0 | 11.8 | 8.8 | * | 9.3 | 11.5 | 9.0 | 7.0 | * | 19.7 | 19.9 | 19.9 | 17.1 | |
| Other forms of ischemic heart diseases (%) | 11.4 | 13.6 | 9.9 | 7.7 | * | 8.0 | 9.9 | 7.6 | 6.2 | * | 15.6 | 15.5 | 16.7 | 14.3 | |
| Previous heart failures (%) | 6.3 | 8.6 | 4.3 | 2.9 | * | 2.9 | 4.2 | 2.4 | 1.9 | * | 10.5 | 10.9 | 9.8 | 7.4 | * |
| Other cardiac conditions (%) | 2.6 | 3.2 | 1.9 | 1.8 | * | 1.3 | 2.0 | 1.2 | 0.8 | * | 4.0 | 3.8 | 4.3 | 6.0 | * |
| Conduction disorders and cardiac dysrhythmias (%) | 6.3 | 8.5 | 4.5 | 3.0 | * | 2.8 | 4.2 | 2.4 | 1.7 | * | 10.6 | 10.7 | 11.0 | 8.8 | |
| Cerebrovascular diseases (%) | 8.8 | 11.2 | 7.0 | 4.8 | * | 4.6 | 6.1 | 4.3 | 3.1 | * | 14.0 | 13.9 | 15.0 | 12.3 | |
| Vascular diseases (%) | 7.1 | 8.4 | 6.2 | 4.7 | * | 5.6 | 7.3 | 5.3 | 3.9 | * | 8.9 | 9.0 | 9.1 | 8.1 | |
| Chronic obstructive pulmonary disease (%) | 4.0 | 5.2 | 3.3 | 1.7 | * | 2.3 | 3.4 | 2.1 | 1.2 | * | 6.1 | 6.2 | 6.7 | 4.3 | |
| Chronic nephropathies (%) | 11.1 | 14.5 | 8.1 | 6.2 | * | 5.1 | 6.7 | 4.7 | 3.7 | * | 18.5 | 18.6 | 18.4 | 18.1 | |
| NSTEMI (%) | 55.0 | 60.8 | 49.5 | 47.1 | * | 47.7 | 54.3 | 45.0 | 43.8 | * | 63.8 | 64.1 | 62.8 | 62.0 | |
| Previous AMI episodes (%) | 9.4 | 10.1 | 9.1 | 7.9 | * | 8.0 | 8.8 | 8.0 | 7.3 | * | 11.1 | 10.8 | 12.6 | 10.4 | |
| 30-day readmission (%) | 12.3 | 14.4 | 10.5 | 9.2 | * | 9.6 | 11.5 | 8.7 | 8.6 | * | 15.7 | 16.0 | 15.8 | 12.0 | * |
p < 0.05 in test for trend between levels of education
Low education = no middle school diploma, mid education = middle school diploma, and high education = high school diploma or more