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Table 2 Sample size, number of incident CHD events, and age- and field-center adjusted incidence rates (per 1,000 person-years) by gender, race, and ABI level: the ARIC study, 1987–2001*

From: The association of the ankle-brachial index with incident coronary heart disease: the Atherosclerosis Risk In Communities (ARIC) study, 1987–2001

  Men Women
Covariate Sample size CHD events Rate (95% CI) Sample size CHD events Rate (95% CI)
    Whites    
PAD       
   ABI < 0.90 80 19 21.8 (13.9 – 34.3) 172 14 6.9 (4.1–11.6)
   ABI ≥ 0.90 4446 431 8.0 (7.3–8.9) 5330 222 3.4 (3.0–3.9)
   ABI < 0.90 men, < 0.85 women 80 19 21.9 (13.9–34.4) 69 9 11.1 (5.8–21.3)
   ABI ≥ 0.90 men, ≥ 0.85 women 4446 431 8.0 (7.3–8.9) 5433 227 3.4 (3.0–3.9)
ABI       
   ≤ 0.80 38 10 24.2 (13.0–45.0) 31 9 27.1 (14.0–52.2)
   (0.80–0.90] 43 9 19.5 (10.1–37.6) 142 5 2.9 (1.2–7.0)
   (0.90–1.00] 195 27 11.9 (8.2–17.4) 665 35 4.6 (3.3–6.3)
   (1.00–1.10] 764 91 10.4 (8.4–12.8) 1546 71 3.9 (3.1–4.9)
   (1.10–1.20] 1489 169 9.7 (8.3–11.2) 1712 66 3.1 (2.5–4.0)
   (1.20–1.30] 1321 92 5.7 (4.6–7.0) 994 30 2.3 (1.6–3.3)
   >1.30 676 52 5.9 (4.5–7.8) 412 20 3.5 (2.3–5.5)
    African Americans    
PAD       
   ABI < 0.90 42 14 40.7 (24.0–69.0) 87 11 11.4 (6.3–20.7)
   ABI ≥ 0.90 1308 131 8.9 (7.5–10.6) 2123 122 5.0 (4.2–5.9)
   ABI < 0.90 men, < 0.85 women 42 14 40.7 (24.0–69.0) 52 8 13.6 (6.8–27.2)
   ABI ≥ 0.90 men, ≥ 0.85 women 1308 131 8.9 (7.5–10.6) 2158 125 5.0 (4.2–6.0)
ABI       
   ≤ 0.80 24 6 30.9 (13.8–69.3) 31 7 23.7 (11.3–49.9)
   (0.80–0.90] 18 8 52.5 (26.2–105.2) 56 4 6.0 (2.2–16.0)
   (0.90–1.00] 71 8 10.5 (5.2–21.0) 242 20 7.6 (4.9–11.8)
   (1.00–1.10] 278 34 11.6 (8.3–16.2) 590 46 6.9 (5.2–9.3)
   (1.10–1.20] 461 42 8.3 (6.2–11.3) 708 31 3.8 (2.6–5.3)
   (1.20–1.30] 349 36 8.7 (6.2–12.0) 423 19 3.9 (2.5–6.1)
   >1.30 149 11 6.2 (3.4–11.2) 160 6 2.9 (1.3–6.5)
  1. *Rates are presented at age 55. CHD indicates coronary heart disease; ABI, ankle-brachial index; ARIC, Atherosclerosis Risk in Communities; CI, confidence interval; PAD, peripheral arterial disease.