Comparison of baseline characteristics between First Nations and non–First Nations patients undergoing index angiography, in the unweighted and weighted matched cohorts
| Characteristic | No. (%) of patients* | Standardized difference | ||
|---|---|---|---|---|
| First Nations n = 277 | Non–First Nations n = 277 | Unweighted | Weighted | |
| Matching variables | ||||
| Age, yr, mean ± SD | 55.8 ± 11.7 | 56.0 ± 11.7 | 0.013 | 0.049 |
| Sex, male | 158 (57.0) | 158 (57.0) | 0.000 | 0.000 |
| Urban (Winnipeg) | 146 (52.7) | 146 (52.7) | 0.000 | 0.000 |
| Year of angiography | ||||
| 2008 | 45 (16.3) | 42 (15.2) | 0.030 | 0.106 |
| 2009 | 70 (25.3) | 69 (24.9) | 0.008 | 0.009 |
| 2010 | 65 (23.5) | 71 (25.6) | 0.050 | 0.059 |
| 2011 | 74 (26.7) | 72 (26.0) | 0.016 | 0.066 |
| 2012 | 23 (8.3) | 23 (8.3) | 0.000 | 0.095 |
| Conventional risk-factor variables | ||||
| Family history of coronary artery disease | 87 (31.4) | 119 (43.0) | 0.241 | 0.056 |
| Obesity | 140 (50.5) | 122 (44.0) | 0.130 | 0.060 |
| BMI, mean ± SD | 30.5 ± 6.2 | 30.4 ± 6.8 | 0.015 | 0.053 |
| Current smoker | 138 (49.8) | 88 (31.8) | 0.374 | 0.074 |
| Past smoker (ever) | 215 (77.6) | 157 (56.7) | 0.457 | 0.049 |
| Diabetes | 151 (54.5) | 48 (17.3) | 0.841 | 0.075 |
| Insulin | 56 (20.2) | 16 (5.8) | 0.440 | 0.079 |
| Hypertension | 188 (67.9) | 151 (54.5) | 0.277 | 0.093 |
| Dyslipidemia | 160 (57.8) | 124 (44.8) | 0.262 | 0.140 |
| Income quintile | ||||
| 1 (lowest) | 156 (56.3) | 46 (16.6) | 0.906 | 0.134 |
| 2 | 43 (15.5) | 51 (18.4) | 0.077 | 0.013 |
| 3 | 28 (10.1) | 59 (21.3) | 0.311 | 0.138 |
| 4 | 40 (14.4) | 53 (19.1) | 0.126 | 0.060 |
| 5 (highest) | 10 (3.6) | 68 (24.5) | 0.631 | 0.023 |
| Charlson Comorbidity Index score | 2.3 ± 2.4 | 0.9 ± 1.2 | 0.687 | 0.168 |
| Previous MI | 28 (10.1) | 20 (7.2) | 0.103 | 0.157 |
| Congestive heart failure | 41 (14.8) | 29 (10.5) | 0.131 | 0.011 |
| Cancer | S | 14 (5.1) | 0.179 | 0.012 |
| Peripheral vascular disease | 29 (10.5) | 10 (3.6) | 0.271 | 0.077 |
| Stroke | 23 (8.3) | 12 (4.3) | 0.164 | 0.125 |
| Indication for angiography | ||||
| Rule out coronary artery disease | 64 (23.1) | 56 (20.2) | 0.070 | 0.027 |
| STEMI | 64 (23.1) | 55 (19.9) | 0.079 | < 0.000 |
| NSTEMI | 108 (39.0) | 98 (35.4) | 0.075 | 0.017 |
| Unstable angina | 17 (6.1) | 18 (6.5) | 0.015 | 0.053 |
| Angina | 33 (11.9) | 60 (21.7) | 0.263 | 0.009 |
Note: BMI = body mass index, MI = myocardial infarction, NSTEMI = non–ST-elevation MI, SD = standard deviation, STEMI = ST-elevation MI.
↵* Unless stated otherwise.