Table 1.
Baseline characteristics of patients with acute coronary syndrome (ACS) undergoing percutaneous coronary intervention (PCI) during 2011–2014
| 2011 | 2012 | 2013 | 2014 | P values for trend |
|||||
| n | % | n | % | n | % | n | % | ||
| ACS | 30 800 | 34 974 | 39 524 | 39 361 | |||||
| UAP | 22 038 | 71.6 | 24 847 | 71.0 | 28 727 | 72.7 | 28 508 | 72.4 | <0.0001 |
| STEMI | 6514 | 21.1 | 7302 | 20.9 | 7889 | 20.0 | 7856 | 20.0 | <0.0001 |
| NSTEMI | 2248 | 7.3 | 2825 | 8.1 | 2908 | 7.4 | 2997 | 7.6 | 0.87 |
| Age, years | 30 651 | 34 872 | 39 466 | 39 351 | |||||
| 18–24 | 12 | 0.0 | 8 | 0.0 | 16 | 0.0 | 15 | 0.0 | 0.70 |
| 25–34 | 177 | 0.6 | 223 | 0.6 | 246 | 0.6 | 243 | 0.6 | 0.62 |
| 35–44 | 1597 | 5.2 | 1930 | 5.5 | 2149 | 5.4 | 2187 | 5.6 | 0.09 |
| 45–54 | 5849 | 19.1 | 6663 | 19.1 | 7283 | 18.5 | 7507 | 19.1 | 0.52 |
| 55–64 | 10 291 | 33.6 | 11 990 | 34.4 | 13 888 | 35.2 | 13 381 | 34.0 | 0.11 |
| 65–74 | 8615 | 28.1 | 9510 | 27.3 | 10 650 | 27.0 | 10 832 | 27.5 | 0.09 |
| 75–84 | 3850 | 12.6 | 4227 | 12.1 | 4884 | 12.4 | 4800 | 12.2 | 0.33 |
| >84 | 260 | 0.8 | 321 | 0.9 | 350 | 0.9 | 386 | 1.0 | 0.11 |
| Gender | 30 155 | 34 191 | 39 189 | 39 336 | |||||
| Male | 22 017 | 73.0 | 25 423 | 74.4 | 29 104 | 74.3 | 29 193 | 74.2 | <0.01 |
| Female | 8138 | 27.0 | 8768 | 25.6 | 10 085 | 25.7 | 10 143 | 25.8 | |
| Ethnicity | 30 800 | 34 974 | 39 524 | 39 361 | |||||
| Han | 30 589 | 99.3 | 34 691 | 99.2 | 38 974 | 98.6 | 38 620 | 98.1 | <0.0001 |
| Others | 211 | 0.7 | 283 | 0.8 | 550 | 1.4 | 741 | 1.9 | |
| Region of hospital | 30 783 | 34 970 | 39 524 | 39 361 | |||||
| North China | 9156 | 29.7 | 9631 | 27.5 | 9914 | 25.1 | 11 086 | 28.2 | <0.0001 |
| Northwest | 7632 | 24.8 | 7939 | 22.7 | 9728 | 24.6 | 7821 | 19.9 | <0.0001 |
| Northeast | 3924 | 12.7 | 5347 | 15.3 | 6691 | 16.9 | 7284 | 18.5 | <0.0001 |
| East China | 3742 | 12.2 | 4630 | 13.2 | 5053 | 12.8 | 5241 | 13.3 | <0.001 |
| Southwest | 3515 | 11.4 | 4346 | 12.4 | 4877 | 12.3 | 4549 | 11.6 | 0.96 |
| Central China | 1977 | 6.4 | 1928 | 5.5 | 1910 | 4.8 | 1944 | 4.9 | <0.0001 |
| South China | 837 | 2.7 | 1149 | 3.3 | 1351 | 3.4 | 1436 | 3.6 | <0.0001 |
| Comorbidities | 30 800 | 34 974 | 39 524 | 39 361 | |||||
| Hypertension | 17 600 | 57.1 | 19 942 | 57.0 | 21 260 | 53.8 | 21 701 | 55.1 | <0.0001 |
| Hyperlipidaemia | 6844 | 22.2 | 7774 | 22.2 | 7420 | 18.8 | 7330 | 18.6 | <0.0001 |
| Diabetes mellitus | 6829 | 22.2 | 7817 | 22.4 | 8394 | 21.2 | 8819 | 22.4 | 0.75 |
| COPD | 541 | 1.8 | 448 | 1.3 | 478 | 1.2 | 447 | 1.1 | <0.0001 |
| Current smoking | 9093 | 29.5 | 10 838 | 31.0 | 11 467 | 29.0 | 10 568 | 26.8 | <0.0001 |
| Heart failure* | 1378 | 4.5 | 1373 | 3.9 | 1331 | 3.4 | 1122 | 2.9 | <0.0001 |
| Renal failure* | 277 | 0.9 | 297 | 0.8 | 259 | 0.7 | 276 | 0.7 | <0.001 |
| Under dialysis* | 34 | 0.1 | 52 | 0.1 | 45 | 0.1 | 45 | 0.1 | 0.71 |
| Prior MI | 7560 | 24.5 | 7828 | 22.4 | 7928 | 20.1 | 5648 | 14.3 | <0.0001 |
| Prior CVD | 2014 | 6.5 | 1912 | 5.5 | 1990 | 5.0 | 2018 | 5.1 | <0.0001 |
| Prior PVD | 457 | 1.5 | 430 | 1.2 | 489 | 1.2 | 515 | 1.3 | 0.09 |
| Prior PCI | 5702 | 18.5 | 6125 | 17.5 | 6467 | 16.4 | 5973 | 15.2 | <0.0001 |
| Prior CVS | 1077 | 3.5 | 1192 | 3.4 | 563 | 1.4 | 14 | 0.0 | <0.0001 |
| Prior CABG | 936 | 3.0 | 952 | 2.7 | 580 | 1.5 | 204 | 0.5 | <0.0001 |
| Familial CAD | 805 | 2.6 | 867 | 2.5 | 681 | 1.7 | 615 | 1.6 | <0.0001 |
*Assessed and recorded at admission.
CABG, coronary artery bypass graft; CAD, coronary artery disease; COPD, chronic obstructive pulmonary disease; CVD, cerebrovascular disease; CVS, cardiac valve surgery; MI, myocardial infarction; NSTEMI, non-ST elevation myocardial infarction; PVD, peripheral vascular disease; STEMI, ST elevation myocardial infarction; UAP, unstable angina pectoris.