Table 1.
Correlations between the average daily volume of emergency physicians and the characteristics of study population.
| Variables | Total | Average daily volume of emergency physicians | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| ≤ Q1 | Q1 ~ Q2 | Q2 ~ Q3 | > Q3 | P value | |||||||
| N | % | N | % | N | % | N | % | N | % | ||
| Total number | 17,661 | 100.00 | 4,659 | 26.38 | 4,822 | 27.30 | 4,365 | 24.72 | 3,815 | 21.60 | |
| PCI service model | < 0.001 | ||||||||||
| Non-24-h | 13,018 | 73.71 | 3,499 | 75.10 | 3,373 | 69.95 | 3,442 | 78.85 | 2,704 | 70.88 | |
| 24-h | 4,643 | 26.29 | 1,160 | 24.90 | 1,449 | 30.05 | 923 | 21.15 | 1,111 | 29.12 | |
| Gender | 0.069 | ||||||||||
| Female | 2,899 | 16.41 | 780 | 16.74 | 825 | 17.11 | 719 | 16.47 | 575 | 15.07 | |
| Male | 14,762 | 83.59 | 3,879 | 83.26 | 3,997 | 82.89 | 3,646 | 83.53 | 3,240 | 84.93 | |
| Age | < 0.001 | ||||||||||
| < 45 | 1,885 | 10.67 | 486 | 10.43 | 483 | 10.02 | 492 | 11.27 | 424 | 11.11 | |
| 45–54 | 3,895 | 22.05 | 962 | 20.65 | 1,065 | 22.09 | 921 | 21.10 | 947 | 24.82 | |
| 55–64 | 4,958 | 28.07 | 1,240 | 26.62 | 1,352 | 28.04 | 1,317 | 30.17 | 1,049 | 27.50 | |
| 65–74 | 3,597 | 20.37 | 1,008 | 21.64 | 993 | 20.59 | 849 | 19.45 | 747 | 19.58 | |
| 75–84 | 2,431 | 13.76 | 680 | 14.60 | 685 | 14.21 | 581 | 13.31 | 485 | 12.71 | |
| ≥ 85 | 895 | 5.07 | 283 | 6.07 | 244 | 5.06 | 205 | 4.70 | 163 | 4.27 | |
| Mean ± SD | 61.88 ± 13.53 | 62.64 ± 13.93 | 62.13 ± 13.48 | 61.60 ± 13.51 | 60.98 ± 13.19 | ||||||
| CCI score1 | 0.004 | ||||||||||
| 0 | 6,914 | 39.15 | 1,754 | 37.65 | 1,855 | 38.47 | 1,710 | 39.18 | 1,595 | 41.81 | |
| 1 | 5,314 | 30.09 | 1,409 | 30.24 | 1,452 | 30.11 | 1,315 | 30.13 | 1,138 | 29.83 | |
| 2 | 2,069 | 11.72 | 548 | 11.76 | 577 | 11.97 | 500 | 11.45 | 444 | 11.64 | |
| 3 | 1,464 | 8.29 | 404 | 8.67 | 403 | 8.36 | 361 | 8.27 | 296 | 7.76 | |
| ≥ 4 | 1,900 | 10.76 | 544 | 11.68 | 535 | 11.09 | 479 | 10.97 | 342 | 8.96 | |
| Monthly salary (NTD) | < 0.001 | ||||||||||
| ≤ 17,280 | 4,291 | 24.30 | 1,226 | 26.31 | 1,164 | 24.14 | 1,019 | 23.34 | 882 | 23.12 | |
| 17,281–22,080 | 2,625 | 14.86 | 671 | 14.40 | 732 | 15.18 | 677 | 15.51 | 545 | 14.29 | |
| 22,081–36,300 | 6,758 | 38.27 | 1,717 | 36.85 | 1,843 | 38.22 | 1,746 | 40.00 | 1,452 | 38.06 | |
| ≥ 36,301 | 3,987 | 22.58 | 1,045 | 22.43 | 1,083 | 22.46 | 923 | 21.15 | 936 | 24.53 | |
| Urbanization level | < 0.001 | ||||||||||
| Level 1 | 3,679 | 20.83 | 976 | 20.95 | 926 | 19.20 | 789 | 18.08 | 988 | 25.90 | |
| Level 2 | 5,595 | 31.68 | 1,397 | 29.98 | 1,635 | 33.91 | 1,486 | 34.04 | 1,077 | 28.23 | |
| Level 3 | 3,427 | 19.40 | 908 | 19.49 | 876 | 18.17 | 818 | 18.74 | 825 | 21.63 | |
| Level 4 | 2,746 | 15.55 | 746 | 16.01 | 751 | 15.57 | 713 | 16.33 | 536 | 14.05 | |
| Levels 5–7 | 2,214 | 12.54 | 632 | 13.57 | 634 | 13.15 | 559 | 12.81 | 389 | 10.20 | |
| Other catastrophic illness | 0.035 | ||||||||||
| No | 16,531 | 93.60 | 4,365 | 93.69 | 4,483 | 92.97 | 4,078 | 93.42 | 3,605 | 94.50 | |
| Yes | 1,130 | 6.40 | 294 | 6.31 | 339 | 7.03 | 287 | 6.58 | 210 | 5.50 | |
| MI severity | 0.152 | ||||||||||
| 1 blood vessel | 15,475 | 87.62 | 4,041 | 86.74 | 4,230 | 87.72 | 3,833 | 87.81 | 3,371 | 88.36 | |
| 2 blood vessels | 1,990 | 11.27 | 558 | 11.98 | 535 | 11.09 | 482 | 11.04 | 415 | 10.88 | |
| ≥ 3 blood vessels | 196 | 1.11 | 60 | 1.29 | 57 | 1.18 | 50 | 1.15 | 29 | 0.76 | |
| Coronary stent implantation | < 0.001 | ||||||||||
| No | 12,709 | 71.96 | 3,385 | 72.66 | 3,505 | 72.69 | 3,031 | 69.44 | 2,788 | 73.08 | |
| Yes | 4,952 | 28.04 | 1,274 | 27.34 | 1,317 | 27.31 | 1,334 | 30.56 | 1,027 | 26.92 | |
| Triage level | < 0.001 | ||||||||||
| Level 1 | 4,140 | 23.44 | 1,052 | 22.58 | 1,187 | 24.62 | 1,048 | 24.01 | 853 | 22.36 | |
| Level 2 | 10,360 | 58.66 | 2,868 | 61.56 | 2,813 | 58.34 | 2,438 | 55.85 | 2,241 | 58.74 | |
| Level 3 | 2,966 | 16.79 | 702 | 15.07 | 772 | 16.01 | 828 | 18.97 | 664 | 17.40 | |
| Level 4 & 5 | 195 | 1.10 | 37 | 0.79 | 50 | 1.04 | 51 | 1.17 | 57 | 1.49 | |
| Accumulated PCI operator volume | < 0.001 | ||||||||||
| ≤ Q1 | 4,577 | 25.92 | 1,415 | 30.37 | 1,302 | 27.00 | 1,097 | 25.13 | 763 | 20.00 | |
| Q1 ~ Q2 | 4,364 | 24.71 | 1,085 | 23.29 | 1,298 | 26.92 | 1,037 | 23.76 | 944 | 24.74 | |
| Q2 ~ Q3 | 4,396 | 24.89 | 1,035 | 22.22 | 1,193 | 24.74 | 1,096 | 25.11 | 1,072 | 28.10 | |
| > Q3 | 4,324 | 24.48 | 1,124 | 24.13 | 1,029 | 21.34 | 1,135 | 26.00 | 1,036 | 27.16 | |
| Previous year’s PCI operator volume | < 0.001 | ||||||||||
| ≤ Q1 | 4,728 | 26.77 | 1,509 | 32.39 | 1,376 | 28.54 | 1,115 | 25.54 | 728 | 19.08 | |
| Q1 ~ Q2 | 4,408 | 24.96 | 1,114 | 23.91 | 1,307 | 27.10 | 1,062 | 24.33 | 925 | 24.25 | |
| Q2 ~ Q3 | 4,146 | 23.48 | 966 | 20.73 | 1,200 | 24.89 | 1,033 | 23.67 | 947 | 24.82 | |
| > Q3 | 4,379 | 24.79 | 1,070 | 22.97 | 939 | 19.47 | 1,155 | 26.46 | 1,215 | 31.85 | |
| Hospital level | < 0.001 | ||||||||||
| Medical centers | 6,212 | 35.17 | 1,809 | 38.83 | 1,624 | 33.68 | 1,298 | 29.74 | 1,481 | 38.82 | |
| Regional hospitals | 9,666 | 54.73 | 2,118 | 45.46 | 2,723 | 56.47 | 2,729 | 62.52 | 2,096 | 54.94 | |
| District hospitals | 1,783 | 10.10 | 732 | 15.71 | 475 | 9.85 | 338 | 7.74 | 238 | 6.24 | |
| Hospital ownership | < 0.001 | ||||||||||
| Public | 5,168 | 29.26 | 2,159 | 46.34 | 1,538 | 31.90 | 930 | 21.31 | 541 | 14.18 | |
| Nonpublic | 12,493 | 70.74 | 2,500 | 53.66 | 3,284 | 68.10 | 3,435 | 78.69 | 3,274 | 85.82 | |
| Previous year’s PCI institutional volume | < 0.001 | ||||||||||
| ≤ Q1 | 4,721 | 26.73 | 1,407 | 30.20 | 1,273 | 26.40 | 1,287 | 29.48 | 754 | 19.76 | |
| Q1 ~ Q2 | 4,306 | 24.38 | 1,148 | 24.64 | 1,264 | 26.21 | 1,002 | 22.96 | 892 | 23.38 | |
| Q2 ~ Q3 | 4,328 | 24.51 | 1,260 | 27.04 | 1,118 | 23.19 | 981 | 22.47 | 969 | 25.40 | |
| > Q3 | 4,306 | 24.38 | 844 | 18.12 | 1,167 | 24.20 | 1,095 | 25.09 | 1,200 | 31.45 | |
1Myocardial infarction was excluded from CCI score calculation.