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Table 1 Demographic data for the 192 subjects who reported on day of study

From: A new efficient trial design for assessing reliability of ankle-brachial index measures by three different observer groups

  Group 1 Group 2 Group 3 Group 4 Group 5 Stand-bys Total p-values (global test of all 5 groups)* Validation groups (Groups 1, 2 and 3)
Number of participants 36 36 36 36 48 192   108
Age: mean (± SD) 68.8 (1.4) 68.7 (1.5) 68.5 (1.5) 68.3 (1.5) 68.7 (2.4) 68.6 (1.7) 0.619 68.7 (1.5)
Sex: N (%)        0.530  
   M 15 (41.7%) 20 (55.6%) 15 (41.7%) 19 (52.8%) 27 (56.3%) 96 (50%)   50 (46.3%)
   F 21 (58.3%) 16 (44.4%) 21 (58.3%) 17 (47.2%) 21 (43.7%) 96 (50%)   58 (53.7%)
BMI: mean (± SD) 28.5 (4.3) 29.2 (4.7) 29.2 (4.0) 29.0 (5.2) 29.3 (4.9) 29.1 (4.6) 0.956 29.0 (4.3)
< 25: N (%) 5 (13.9%) 7 (19.4%) 2 (5.6%) 5 (13.9%) 11 (22.9%) 30 (15.6%) 0.455 14 (13.0%)
25 – < 30: N (%) 19 (52.8%) 16 (44.4%) 19 (52.8%) 18 (50.0%) 16 (33.3%) 88 (45.8%)   54 (50.0%)
>= 30: N (%) 12 (33.3%) 13 (36.1%) 15 (41.7%) 13 (36.1%) 21 (43.8%) 74 (38.5%)   40 (37.0%)
WHR: mean (± SD) 0.91 (0.09) 0.93 (0.09) 0.91 (0.08) 0.95 (0.09) 0.92 (0.08) 0.92 (0.09) 0.408 0.92 (0.09)
   M 0.97 (0.05) 1.0 (0.04) 0.99 (0.07) 1.0 (0.06) 0.97 (0.07)    0.99 (0.05)
   F 0.86 (0.09) 0.84 (0.05) 0.86 (0.05) 0.89 (0.07) 0.87 (0.05)    0.86 (0.06)
Smoker status: N (%)         
   Active smoker 3 (8.3%) 3 (8.3%) 4 (11.1%) 7 (19.4%) 6 (12.5%) 23 (12.0%) 0.538 10 (9.3%)
   Former smoker 17 (47.2%) 17 (47.2%) 10 (27.8%) 11 (30.6%) 19 (39.6%) 74 (38.5%)   44.(40.7%)
   Non-smoker 16 (44.4%) 16 (44.4%) 22 (61.1%) 18 (50.0%) 23 (47.9%) 95 (49.5%)   54 (50.0%)
Hypertension: N (%)         
   Yes 20 (57.1%) 20 (57.1%) 21 (60.0%) 20 (55.6%) 34 (70.8%) 115 (60.8%) 0.571 61 (58.1%)
   No 15 (42.9%) 15 (42.9%) 14 (40.0%) 16 (44.4%) 14 (29.2%) 74 (39.2%)   44 (41.9%)
   Missing 1 1 1 0 0 3   3
Hypercholesterolemia: N (%)         
   Yes 18 (52.9%) 16 (45.7%) 23 (65.7%) 16 (55.2%) 21 (48.8%) 94 (53.4%) 0.501 57 (54.8%)
   No 16 (47.1%) 19 (54.3%) 12 (34.3%) 13 (44.8%) 22 (51.2%) 82 (46.6%)   47 (45.2%)
   Missing 2 1 1 7 5 16   4
Diabetes: N (%)         
   Yes 4 (11.1%) 7 (19.4%) 6 (16.7%) 5 (13.9%) 11 (22.9%) 33 (17.2%) 0.673 17 (15.7%)
   No 32 (88.9%) 29 (80.6%) 30 (83.3%) 31 (86.1%) 37 (77.1%) 159 (82.8%)   91 (84.3%)
Vascular-widening procedures (n): N (%)         
   Yes 0 (0%) 1 (2.8%) 0 (0%) 2 (5.6%) 3 (6.5%) 6 (3.2%) 0.359 1 (0.9%)
   No 36 (100%) 35 (97.2%) 36 (100%) 34 (94.4%) 43 (93.5%) 184 (96.8%)   107 (99.1%)
   Missing 0 0 0 0 2 2   0
  1. * p-values: Chi square, Fisher's exact test or analysis of variance