| Area-based income index (quintiles) | p Trend | |||||
| I high | II | III | IV | V low | ||
| Coronary artery bypass grafting | ||||||
| % | 2.8 | 3.5 | 4.0 | 2.7 | 5.1 | |
| OR* (95% CI) | 1.00 | 1.21 (0.77 to 1.91) | 1.42 (0.91 to 2.22) | 0.89 (0.55 to 1.43) | 1.93 (1.23 to 3.05) | 0.023 |
| OR† (95% CI) | 1.00 | 1.13 (0.74 to 1.72) | 1.26 (0.84 to 1.89) | 0.84 (0.54 to 1.30) | 1.69 (1.15 to 2.48) | 0.046 |
| Valve replacement | ||||||
| % | 4.3 | 5.0 | 6.1 | 6.2 | 6.5 | |
| OR* (95% CI) | 1.00 | 1.11 (0.56 to 2.20) | 1.34 (0.70 to 2.56) | 1.41 (0.74 to 2.69) | 1.65 (0.86 to 3.18) | 0.090 |
| OR† (95% CI) | 1.00 | 1.08 (0.57 to 2.05) | 1.28 (0.70 to 2.36) | 1.30 (0.72 to 2.37) | 1.52 (0.83 to 2.77) | 0.126 |
| Carotid endarterectomy | ||||||
| % | 0.6 | 1.4 | 1.3 | 0.5 | 0.5 | |
| OR* (95% CI) | 1.00 | 2.76 (0.98 to 7.75) | 2.46 (0.87 to 6.91) | 0.87 (0.26 to 2.88) | 0.97 (0.30 to 3.10) | 0.180 |
| OR† (95% CI) | 1.00 | 3.01 (0.96 to 9.50) | 2.61 (0.84 to 8.09) | 0.69 (0.18 to 2.59) | 0.96 (0.27 to 3.43) | 0.066 |
| Major vascular bypass | ||||||
| % | 11.2 | 9.3 | 10.4 | 7.4 | 6.9 | |
| OR* (95% CI) | 1.00 | 0.38 (0.05 to 3.21) | 0.71 (0.11 to 4.73) | 0.35 (0.05 to 2.72) | 0.51 (0.08 to 3.47) | 0.553 |
| OR† (95% CI) | 1.00 | 0.60 (0.26 to 1.37) | 0.81 (0.37 to 1.76) | 0.49 (0.21 to 1.12) | 0.58 (0.26 to 1.29) | 0.203 |
| Repair of unruptured abdominal aorta aneurysm | ||||||
| % | 2.7 | 5.1 | 3.8 | 3.7 | 5.1 | |
| OR* (95% CI) | 1.00 | 1.98 (1.03 to 3.80) | 1.40 (0.70 to 2.80) | 1.48 (0.74 to 2.95) | 2.03 (1.03 to 3.97) | 0.168 |
| OR† (95% CI) | 1.00 | 1.81 (0.90 to 3.62) | 1.24 (0.61 to 2.55) | 1.22 (0.58 to 2.58) | 1.68 (0.82 to 3.43) | 0.493 |
*OR, two-level logistic regression (hospital and subject). OR adjusted for city of residence, gender, age and comorbidities.
†OR single level logistic regression. OR adjusted for city of residence, gender, age, comorbidities and hospital.