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Table 1 Baseline characteristics of the study participants

From: Evidence-based oral antiplatelet therapy among hospitalized Chinese patients with acute myocardial infarction: results from the Chinese acute myocardial infarction registry

  Overall population (%/Mean ± SD) STEMI (%/Mean ± SD) NSTEMI (%/Mean ± SD) P value
  N = 40,202 N = 30,179 N = 10,023  
Demographics     
Age (years)      < 0.001
 < 55 11,786 (29.32%) 9475 (31.4%) 2311 (23.06%)  
 55–65 11,116 (27.65%) 8562 (28.37%) 2554 (25.48%)  
 65–75 10,005 (24.89%) 7218 (23.92%) 2787 (27.81%)  
 >  = 75 7295 (18.15%) 4924 (16.32%) 2371 (23.66%)  
Sex      < 0.001
 Male 29,815 (74.16%) 22,963 (76.09%) 6852 (68.36%)  
 Female 10,387 (25.84%) 7216 (23.91%) 3171 (31.64%)  
Access (n, %)      < 0.001
 Emergency 4107 (10.52%) 3287 (11.24%) 820 (8.37%)  
 External referral 22,944 (58.77%) 16,520 (56.49%) 6424 (65.56%)  
 Family members or others Referral 9852 (25.24%) 8098 (27.69%) 1754 (17.9%)  
 Hospital ward 444 (1.14%) 249 (0.85%) 195 (1.99%)  
 Self-referral 1694 (4.34%) 1088 (3.72%) 606 (6.18%)  
Time from onset to treatment  < 0.001
 < 24 28,664 (71.3%) 22,427 (74.31%) 6237 (62.23%)  
 > 24 h 7873 (19.58%) 4918 (16.3%) 2955 (29.48%)  
 Uncertain 3665 (9.12%) 2834 (9.39%) 831 (8.29%)  
Educational level (%)     0.0019
 College or above 3097 (7.7%) 2396 (7.94%) 701 (6.99%)  
 Below junior college 37,105 (92.3%) 27,783 (92.06%) 9322 (93.01%)  
Regions      < 0.001
 Eastern 15,929 (39.62%) 11,577 (38.36%) 4352 (43.42%)  
 Central 18,101 (45.03%) 13,961 (46.26%) 4140 (41.3%)  
 western 6172 (15.35%) 4641 (15.38%) 1531 (15.27%)  
Medical history (n, %)
 Previous MI 2894 (7.2%) 1751 (5.8%) 1143 (11.4%)  < 0.001
 Previous PCI 750 (1.87%) 496 (1.64%) 254 (2.53%)  < 0.001
 Previous CABG 144 (0.36%) 60 (0.2%) 84 (0.84%)  < 0.001
 Previous heart failure 938 (2.33%) 379 (1.26%) 559 (5.58%)  < 0.001
 Previous stroke 3524 (8.77%) 2525 (8.37%) 999 (9.97%)  < 0.001
 Previous peripheral arterial disease 271 (0.67%) 157 (0.52%) 114 (1.14%)  < 0.001
 Bleeding history 459 (1.14%) 330 (1.09%) 129 (1.29%) 0.1188
Cardiovascular risk factors (n, %)
 Diabetes mellitus 7504 (18.67%) 5166 (17.12%) 2338 (23.33%)  < 0.001
 Hypertension 19,661 (48.91%) 13,958 (46.25%) 5703 (56.9%)  < 0.001
 Hyperlipidemia 2808 (6.98%) 1991 (6.6%) 817 (8.15%)  < 0.001
 Family history of premature CAD 1237 (3.08%) 952 (3.15%) 285 (2.84%) 0.1151
 Current smoker 18,661 (46.42%) 13,412 (44.44%) 5249 (52.37%)  < 0.001
Treatment strategy (n, %)
 Primary PCI 14,186 (35.29%) 12,998 (43.07%) 1188 (11.85%)  < 0.001
 Elective PCI 9260 (23.03%) 6389 (21.17%) 2871 (28.64%)  < 0.001
 Conservation 5149 (12.81%) 3580 (11.86%) 1569 (15.65%)  < 0.001
  1. STEMI, ST-elevation myocardial infarction; NSTEMI, non-ST-elevation myocardial infarction; SD, standard deviation; MI, myocardial infarction; PCI, percutaneous coronary intervention; CABG, coronary artery bypass graft; CAD, coronary artery disease