Table 3.
Institution and Operator Volumes According to the Tertiles of Population Density
| Population Density | Overall |
Low <951.7 People/km2 |
Medium 951.7–4729.7 People/km2 |
High ≥4729.7 People/km2 |
P Value |
|---|---|---|---|---|---|
| No. of patients | 209 521 | 69 797 | 69 750 | 69 974 | |
| No. of institutions | 1126 | 406 | 359 | 361 | |
| Annual number of patients with STEMI per institution | 29.0 (9.60–53.2) | 27.6 (9.65–49.0) | 27.6 (7.90–55.5) | 32.8 (12.2–58.6) | 0.13 |
| Annual number (%) of patients with STEMI per institution> 36* | 478 (42.5) | 156 (38.4) | 157 (43.7) | 165 (45.7) | 0.11 |
| No. of operators per institution | 7 (4–12) | 6 (3–10) | 7 (3–13) | 8 (5–13) | <0.001 |
| No. of operators | 7095 | 2518 | 2761 | 2951 | |
| Annual number of patients with STEMI per operator | 3.4 (1.2–7.2) | 3.8 (1.4–8.0) | 3.4 (1.2–7.0) | 3.2 (1.2–6.6) | <0.001 |
| Annual number (%) of patients with STEMI per operators> 11* | 989 (12.0) | 353 (14.0) | 319 (11.5) | 317 (10.7) | <0.001 |
STEMI indicates ST‐segment–elevation myocardial infarction.
a
Specific cutoff values were chosen according to the ACCF/AHA/SCAI 2013 Update of the Clinical Competence Statement on Coronary Artery Interventional Procedures. 14