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Table 4 Incident strokes* for men and women with baseline bilateral common carotid artery phenotypes

From: Bilateral common carotid artery ultrasound for prediction of incident strokes using intima-media thickness and external diameter: an observational study

CCA Phenotypes: Number Incident stroke
Ten non-overlapping phenotypes Women Men Women N (%) Men N (%)
1) IMT and diameter both large bilaterally 852 662 42 (4.9) 51 (7.7)
2) IMT and diameter large on one side and opposite IMT large (bilaterally large IMT) 271 229 4 (1.5) 12 (5.2)
3) IMT and diameter large on one side and opposite diameter large (bilaterally large diameter) 448 370 6 (1.3) 19 (5.1)
4) IMT and diameter large on one side and neither opposite IMT nor diameter large 206 172 1 (0.5) 1 (0.6)
5) Bilaterally large IMT, no large diameter 322 223 6 (1.9) 10 (4.5)
6) Unilaterally large IMT (R or L) and opposite diameter large 106 86 1 (0.9) 0
7) Unilaterally large IMT (R or L) and no large diameter 504 417 1 (0.2) 7 (1.7)
8) Bilaterally large diameter, no large IMT 269 223 1 (0.4) 5 (2.2)
9) Unilaterally large diameter, (R or L), No large IMT 283 270 2 (0.7) 3 (1.1)
10) No IMT or diameter large 753 610 2 (0.3) 7 (1.2)
All 4014 3262 66 (1.6) 115 (3.5)
Combined phenotypes     
IMT large bilaterally, regardless of diameter (Phenotypes:1,2,5) 1445 1114 52 (3.6) 73 (6.6)
Diameter large bilaterally, regardless of IMT (Phenotypes:1,3,8) 1569 1255 49 (3.1) 75 (6.0)
Large IMT bilaterally and/or large diameter bilaterally (Phenotypes: 1,2,3,5,8) 2162 1707 59 (2.7) 97 (5.7)
IMT and diameter both large on same side, unilaterally or bilaterally (Phenotypes: 1,2,3,4) 1777 1433 53 (3.0) 83 (5.8)
Large IMT, unilaterally or bilaterally, regardless of diameter (Phenotypes: 1-7) 2709 2159 61 (2.3) 100 (4.6)
Large diameter, unilaterally or bilaterally, regardless of IMT (Phenotypes: 1,2,3,4,6,8,9) 2435 2012 56 (2.5) 91 (4.7)
  1. *First time strokes occurring after baseline (1987–89) through December 31, 1999 with follow up of 10 to 12 years.
  2. Large is defined as ≥ the gender- and side-specific ultrasound medians for IMT and external diameter in Table 1.
  3. CCA common carotid artery, IMT intima-media thickness.