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Table 1 Characteristics of 12,030 patients, registered for bypass surgery in British Columbia 1992–2005, overall and by urgency group at registration

From: The occurrence of adverse events in relation to time after registration for coronary artery bypass surgery: a population-based observational study

Characteristic All patients* (n = 12,030) Urgent (n = 739) Semiurgent (n = 8,769) Nonurgent (n = 2,304)
Sex         
 Men 9981 (83.0) 599 (81.1) 7327 (83.6) 1878 (81.5)
 Women 2049 (17.0) 140 (18.9) 1442 (16.4) 426 (18.5)
Age group (years)         
 <50 851 (7.1) 49 (6.6) 606 (6.9) 187 (8.1)
 50–59 2665 (22.2) 140 (18.9) 1946 (22.2) 541 (23.5)
 60–69 4510 (37.5) 266 (36.0) 3313 (37.8) 858 (37.2)
 70–79 3648 (30.3) 247 (33.4) 2652 (30.2) 657 (28.5)
 ≥80 356 (3.0) 37 (5.0) 252 (2.9) 61 (2.6)
Coronary anatomy at registration         
 Left main 1780 (14.8) 493 (66.7) 1253 (14.3) 27 (1.2)
 Multivessel† 8715 (72.4) 195 (26.4) 6673 (76.1) 1792 (77.8)
 Limited‡ 1535 (12.8) 51 (6.9) 843 (9.6) 485 (21.1)
Comorbidity at registration         
 Major conditions§ 2901 (24.1) 184 (24.9) 2084 (23.8) 556 (24.1)
 Other conditions|| 2856 (23.7) 217 (29.4) 2139 (24.4) 462 (20.1)
 None 6273 (52.1) 338 (45.7) 4546 (51.8) 1286 (55.8)
Calendar period at registration         
 1992–1996 4489 (37.3) 390 (52.8) 3239 (36.9) 822 (35.7)
 1997–2001 4293 (35.7) 200 (27.1) 3049 (34.8) 1013 (44.0)
 2002–2005 3248 (27.0) 149 (20.2) 2481 (28.3) 469 (20.4)
Institution at registration         
 1 2668 (22.2) 137 (18.5) 1987 (22.7) 523 (22.7)
 2 2873 (23.9) 258 (34.9) 2380 (27.1) 202 (8.8)
 3 2914 (24.2) 62 (8.4) 1455 (16.6) 1249 (54.2)
 4 3575 (29.7) 282 (38.2) 2947 (33.6) 330 (14.3)
Institution booking catheterization         
 1 2759 (22.9) 152 (20.6) 2079 (23.7) 500 (21.7)
 2 2775 (23.1) 249 (33.7) 2296 (26.2) 201 (8.7)
 3 2037 (16.9) 36 (4.9) 1048 (12.0) 857 (37.2)
 4 2798 (23.3) 211 (28.6) 2235 (25.5) 331 (14.4)
 Other 1661 (13.8) 91 (12.3) 1111 (12.7) 415 (18.0)
Mode of admission for catheterization         
 Emergency department 862 (7.2) 100 (13.5) 644 (7.3) 107 (4.6)
 Otherwise¶ 11168 (92.8) 639 (86.5) 8125 (92.7) 2197 (95.4)
Urgency at admission for catheterization         
 Elective 9600 (79.8) 496 (67.1) 6920 (78.9) 2007 (87.1)
 Emergency or urgent 2430 (20.2) 243 (32.9) 1849 (21.1) 297 (12.9)
Weeks between catheterization and registration         
 0–1 6651 (55.3) 519 (70.2) 4743 (54.1) 1268 (55.0)
 2–3 2066 (17.2) 120 (16.2) 1564 (17.8) 357 (15.5)
 4–5 1041 (8.7) 40 (5.4) 811 (9.2) 174 (7.6)
 6–7 642 (5.3) 17 (2.3) 483 (5.5) 131 (5.7)
 ≥8 1630 (13.5) 43 (5.8) 1168 (13.3) 374 (16.2)
Socioeconomic decile         
 1 1160 (9.6) 77 (10.4) 818 (9.3) 246 (10.7)
 2 1208 (10.0) 68 (9.2) 888 (10.1) 236 (10.2)
 3 1172 (9.7) 85 (11.5) 832 (9.5) 241 (10.5)
 4 1182 (9.8) 46 (6.2) 916 (10.4) 202 (8.8)
 5 1122 (9.3) 82 (11.1) 825 (9.4) 194 (8.4)
 6 1103 (9.2) 67 (9.1) 799 (9.1) 211 (9.2)
 7 1119 (9.3) 65 (8.8) 805 (9.2) 214 (9.3)
 8 1167 (9.7) 65 (8.8) 862 (9.8) 222 (9.6)
 9 1138 (9.5) 75 (10.1) 819 (9.3) 233 (10.1)
 10 1124 (9.3) 76 (10.3) 818 (9.3) 203 (8.8)
 Unknown or missing 535 (4.4) 33 (4.5) 387 (4.4) 102 (4.4)
  1. *Includes 218 patients for whom urgency was not provided.
  2. †Two or three-vessel disease with stenosis of the proximal left anterior descending (PLAD) artery.
  3. ‡Two-vessel disease with no stenosis of the PLAD artery or one-vessel disease with stenosis of the PLAD artery.
  4. §Congestive heart failure, diabetes mellitus, chronic obstructive pulmonary disease, rheumatoid arthritis, or cancer.
  5. ||Peripheral vascular disease, cerebrovascular disease, dementia, peptic ulcer disease, hemiplegia, renal disease, or liver disease.
  6. ¶Clinics or day surgery from reporting hospital, or direct patients from admitting department.