Table 1: Trends in demographic and clinical characteristics of patients who underwent PCI from 2004/05 to 2012/13
Fiscal year; % of patients* (n = 128 380) 
Characteristic2004/05
n = 13 733
2005/06
n = 14 299
2006/07
n = 14 462
2007/08
n = 13 341
2008/09
n = 13 778
2009/10
n = 14 299
2010/11
n = 14 862
2011/12
n = 14 531
2012/13
n = 15 075
p value for trend
Demographic
Age, yr, mean ± SD62.3 ± 11.962.7 ± 12.062.7 ± 12.062.6 ± 12.162.9 ± 12.363.1 ± 12.463.5 ± 12.463.9 ± 12.564.1 ± 12.40.007
Sex, male71.671.872.972.071.170.370.370.570.2 < 0.001
Residence, rural 15.314.914.715.114.414.515.115.014.90.7
Income quintile†
    1 (lowest)19.720.420.120.219.719.820.519.919.90.9
    221.120.621.120.220.320.320.420.020.70.07
    319.520.118.919.320.120.019.820.520.20.02
    420.219.619.820.419.820.419.620.120.20.6
    5 (highest)19.119.019.719.619.719.119.319.118.60.2
CCS angina classification†
07.07.36.55.05.45.25.45.56.2 < 0.001
15.25.04.73.53.64.14.54.54.80.06
214.815.214.712.912.313.012.813.012.1 < 0.001
320.019.914.313.211.310.09.08.58.2 < 0.001
≥ 445.148.058.364.066.467.268.268.466.5 < 0.001
Cardiac risk factors and comorbidities
Diabetes mellitus28.629.530.329.730.630.431.831.833.0 < 0.001
Hypertension68.069.674.273.474.073.574.674.174.7 < 0.001
Hyperlipidemia53.754.668.867.366.765.765.363.863.2 < 0.001
Myocardial infarction45.644.043.046.151.558.558.557.154.0 < 0.001
Heart failure5.95.57.86.97.06.56.56.06.40.9
History of stroke1.81.71.51.71.41.51.81.61.70.9
Peripheral vascular disease5.96.26.26.15.95.75.65.25.2 < 0.001
Renal failure2.92.92.82.82.83.13.43.73.4 < 0.001
COPD5.95.67.27.47.17.17.17.17.0 < 0.001
Smoking history48.849.354.855.753.855.353.451.550.10.02
Charlson comorbidity index, mean ± SD0.55 ± 1.030.48 ± 1.010.50 ± 1.090.49 ± 1.090.44 ± 1.020.44 ± 1.050.44 ± 1.060.43 ± 1.050.45 ± 1.03 < 0.001
PCI characteristics‡
Stent type
    Drug-eluting44.850.546.333.637.137.337.941.949 < 0.001
    Bare metal62.255.259.569.062.961.561.957.250 < 0.001
No. of stented vessels
    153.150.851.153.853.855.256.457.156.9 < 0.001
    225.126.026.125.225.825.725.425.225.20.3
     3 16.717.418.016.515.013.313.212.613.0 < 0.001
Stent diameter, mm
     < 345.849.148.645.145.645.745.948.350.10.001
     ≥ 349.245.046.750.348.848.549.246.444.80.002
Total stent length, mm
     < 2035.333.234.137.534.934.135.033.831.1 < 0.001
      2059.761.061.157.959.660.060.060.963.7 < 0.001

Note: CCS = Canadian Cardiovascular Society, COPD = chronic obstructive pulmonary disease, PCI = percutaneous coronary intervention, SD = standard deviation.

*Except where indicated otherwise.

†Percentages were calculated on the basis of all patients, but for each year, percentage for missing data is not reported; thus, percentages sum to slightly less than 100.

‡For stent type and stent-related variables, percentages were calculated using number of patients as the denominator. However, a patient may receive multiple stents during a PCI procedure; hence, percentages for stent type may sum to more than 100. Conversely, some vessels may not have stents placed, so the sum of percentages for stent-related variables may be less than 100.