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CIN: Contrast-induced nephropathy
| Confounding Factor | Diabetic Patients Incidence of CIN (%) | Non-diabetic Patients Incidence of CIN (%) | Chi-Square P-value |
| Age < 50 | 8% | 4% | <0.05 |
| Age 50-69 | 12% | 7% | <0.05 |
| Age ≥ 70 | 18% | 10% | <0.05 |
| With Acute Coronary Syndrome | 15% | 9% | <0.05 |
| Without Acute Coronary Syndrome | 10% | 6% | <0.05 |
