Table 3.
Stratified Analysis: HRs of SCD for Participants With Low ABI (Reference: Normal ABI)
| Variable | HR (95% CI) of SCD for low vs normal ABI; P value | P value for difference between 2 strata | |||
|---|---|---|---|---|---|
| Strata 1 | Strata 2 | ||||
| Age | Above median | 1.806 (1.221–2.671); 0.003 | Below median | 1.173 (0.509–2.703); 0.708 | 0.359 |
| Sex | Male | 2.701 (1.757–4.153); <0.001 | Female | 0.813 (0.443–1.490); 0.502 | 0.002 |
| Race | Black | 1.913 (1.170–3.127); 0.010 | White | 1.430 (0.860–2.379); 0.168 | 0.421 |
| CHD | Yes | 1.371 (0.654–2.872); 0.403 | No | 1.804 (1.215–2.678); 0.003 | 0.521 |
| HF | Yes | 1.760 (0.738–4.194); 0.202 | No | 1.753 (1.191–2.579); 0.004 | 0.994 |
| Diabetes | Yes | 2.720 (1.605–4.610); <0.001 | No | 1.286 (0.783–2.110); 0.320 | 0.042 |
| Hypertension | Yes | 1.743 (1.142–2.659); 0.010 | No | 1.570 (0.842–2.925); 0.156 | 0.785 |
| Obesity (BMI ≥30) | Yes | 1.865 (1.021–3.408); 0.043 | No | 1.546 (0.999–2.391); 0.050 | 0.621 |
Model: adjusted for age, sex, education, race, field center, CHD, HF, DM, BMI, HDL and LDL cholesterols, current drinking, current smoking, hypertension, Cornell voltage, and heart rate. The median age was 54 years. ABI indicates ankle–brachial index; BMI, body mass index; CHD, coronary heart disease; HDL, high‐density lipoprotein; HF, heart failure; HR, hazard ratio; LDL, low‐density lipoprotein; and SCD, sudden cardiac death.