Characteristics of patients undergoing coronary revascularisation procedures
| Variable | PTCA (n=4775) | CABG (n=5115) | Significance 1-151 | ||
| Age (years)‡ | < 56 | 1529 (32) | 1124 (22) | 1-165 | |
| 56–65 | 1775 (37) | 2110 (41) | |||
| 66–75 | 1165 (25) | 1657 (32) | |||
| > 75 | 289 (6) | 224 (4) | |||
| Missing | 17 | 0 | |||
| Sex | Male | 3212 (67) | 3872 (76) | 1-165 | |
| Female | 1555 (33) | 1243 (24) | |||
| Missing | 8 | 0 | |||
| Urgency‡ | Emergency | 584 (12) | 167 (3) | 1-165 | |
| Urgent | 1356 (28) | 891 (17) | |||
| Elective | 2831 (59) | 4057 (79) | |||
| Missing | 4 | 0 | |||
| Left ventricular impairment‡ | None | 2174 (60) | 2212 (56) | 1-165 | |
| Mild/moderate | 1325 (37) | 1519 (39) | |||
| Severe | 98 (3) | 212 (5) | |||
| Missing | 1178 | 1172 | |||
| Number of arteries with significant stenoses | LMS | 175 (4) | 1052 (23) | 1-165 | |
| 1 | 1747 (43) | 198 (4) | |||
| 2 | 1325 (33) | 193 (4) | |||
| 3 | 779 (19) | 3048 (68) | |||
| Missing | 749 | 624 | |||
| Previous AMI | No | 2673 (58) | 1638 (43) | 1-165 | |
| Yes | 1927 (42) | 2155 (57) | |||
| Missing | 175 | 1322 | |||
| BMI ⩾ 30 | No | 2665 (75) | 3469 (71) | 1-165 | |
| Yes | 891 (25) | 1421 (29) | |||
| Missing | 1219 | 225 | |||
| Hypertension | No | 2747 (68) | 2951 (59) | 1-165 | |
| Yes | 1310 (32) | 2032 (41) | |||
| Missing | 718 | 132 | |||
| Diabetes mellitus | No | 3632 (89) | 4490 (88) | NS | |
| Yes | 441 (11) | 618 (12) | |||
| Missing | 702 | 7 | |||
| Severe respiratory disease | No | 3952 (98) | 3408 (93) | 1-165 | |
| Yes | 76 (2) | 241 (7) | |||
| Missing | 747 | 1466 | |||
| Cerebrovascular disease | No | 3971 (98) | 4569 (96) | 1-165 | |
| Yes | 68 (2) | 208 (4) | |||
| Missing | 736 | 338 | |||
| Smoking status‡ | Non-smoker | 1259 (32) | 1454 (30) | 1-165 | |
| Ex-smoker | 1758 (44) | 1854 (38) | |||
| Current smoker | 983 (25) | 1563 (32) | |||
| Missing | 775 | 244 | |||
| Number of antianginal drug treatments‡ | 0 | 229 (6) | 342 (7) | NS | |
| 1 | 874 (21) | 930 (18) | |||
| 2 | 1561 (38) | 2008 (39) | |||
| 3 | 1252 (31) | 1742 (34) | |||
| 4 | 187 (5) | 93 (2) | |||
| Missing | 672 | 0 | |||
Values are n (%).
↵1-151 Statistical significance of difference between PTCA and CABG on χ2 and χ2 for trend (‡) tests:
1-150 p < 0.05;
1-160 p < 0.01;
↵1-165 p < 0.0001; NS, not significant.
AMI, acute myocardial infarction; BMI, body mass index; CABG, coronary artery bypass grafting; cerebrovascular disease, history of stroke or recurrent transient ischaemic attacks, or an internal carotid artery stenosis of ⩾ 70%;emergency, procedure required within 24 hours of referral; current smoker, smoking within one month of procedure; hypertension, systolic blood pressure ⩾160 mm Hg, diastolic blood pressure ⩾90 mm Hg, or current antihypertensive drugs; LMS, left main stem; PTCA, percutaneous transluminal coronary angioplasty;severe respiratory disease, forced expiratory volume in one second (FEV1) < 1.5 l, FEV1 ⩽75% of predicted, or regular use of bronchodilators or corticosteroids; urgent, patient unable to be discharged home between referral and operation on clinical grounds.