Table 1

Baseline characteristics of patients with acute coronary syndrome (ACS) undergoing percutaneous coronary intervention (PCI) during 2011–2014

2011201220132014P values
for trend
n%n%n%n%
ACS30 80034 97439 52439 361
 UAP22 03871.624 84771.028 72772.728 50872.4<0.0001
 STEMI651421.1730220.9788920.0785620.0<0.0001
 NSTEMI22487.328258.129087.429977.60.87
Age, years30 65134 87239 46639 351
 18–24120.080.0160.0150.00.70
 25–341770.62230.62460.62430.60.62
 35–4415975.219305.521495.421875.60.09
 45–54584919.1666319.1728318.5750719.10.52
 55–6410 29133.611 99034.413 88835.213 38134.00.11
 65–74861528.1951027.310 65027.010 83227.50.09
 75–84385012.6422712.1488412.4480012.20.33
 >842600.83210.93500.93861.00.11
Gender30 15534 19139 18939 336
 Male22 01773.025 42374.429 10474.329 19374.2<0.01
 Female813827.0876825.610 08525.710 14325.8
Ethnicity30 80034 97439 52439 361
 Han30 58999.334 69199.238 97498.638 62098.1<0.0001
 Others2110.72830.85501.47411.9
Region of hospital30 78334 97039 52439 361
 North China915629.7963127.5991425.111 08628.2<0.0001
 Northwest763224.8793922.7972824.6782119.9<0.0001
 Northeast392412.7534715.3669116.9728418.5<0.0001
 East China374212.2463013.2505312.8524113.3<0.001
 Southwest351511.4434612.4487712.3454911.60.96
 Central China19776.419285.519104.819444.9<0.0001
 South China8372.711493.313513.414363.6<0.0001
Comorbidities30 80034 97439 52439 361
 Hypertension17 60057.119 94257.021 26053.821 70155.1<0.0001
 Hyperlipidaemia684422.2777422.2742018.8733018.6<0.0001
 Diabetes mellitus682922.2781722.4839421.2881922.40.75
 COPD5411.84481.34781.24471.1<0.0001
 Current smoking909329.510 83831.011 46729.010 56826.8<0.0001
 Heart failure*13784.513733.913313.411222.9<0.0001
 Renal failure*2770.92970.82590.72760.7<0.001
  Under dialysis*340.1520.1450.1450.10.71
 Prior MI756024.5782822.4792820.1564814.3<0.0001
 Prior CVD20146.519125.519905.020185.1<0.0001
 Prior PVD4571.54301.24891.25151.30.09
 Prior PCI570218.5612517.5646716.4597315.2<0.0001
 Prior CVS10773.511923.45631.4140.0<0.0001
 Prior CABG9363.09522.75801.52040.5<0.0001
 Familial CAD8052.68672.56811.76151.6<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.