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Table 1 Distribution of selected characteristics in the whole sample and by the presence of an abnormal ABI

From: Association between different measurements of blood pressure variability by ABP monitoring and ankle-brachial index

  Total sample (n = 425) Abnormal ABI* (n = 58) Normal ABI (n = 367) P**
Age (years) 57.4 ± 12.1 63.6 ± 10.6 56.4 ± 12.0 <0.001
Male 131 (30.8%) 21 (36.2%) 110 (30%) 0.34
Body mass index (kg/m2) 30.8 ± 5.8 29.7 ± 5.5 30.9 ± 5.9 0.12
White 280 (65.9%) 34 (58.6%) 246 (67%) 0.21
Alcohol abuse (> 30 g/day) 35 (8.2%) 6 (10.3%) 29 (7.9%) 0.53
Current Smoking 111 (26.1%) 16 (27.6%) 95 (25.9%) 0.44
(Years at school)     0.005
≤ 4 years 124 (29.2%) 26 (44.8%) 98 (26.7%)  
> 4 years 301 (70.8%) 32 (55.2%) 269 (73.3%)  
Diabetes mellitus 94 (22.1%) 20 (34.5%) 74 (20.2%) 0.01
Duration of hypertension (years)     0.01
≤ 10 years 212 (49,9%) 191 (53.5%) 21 (36.2%)  
> 10 years 203 (47.8%) 166 (46.5%) 37 (63.8%)  
Cardiovascular disease 119 (28%) 19 (32.8%) 100 (27.2%) 0.38
Office SBP (mmHg) 152.4 ± 25.9 156.9 ± 28.8 151.7 ± 25.5 0.16
Office DBP (mmHg) 88.7 ± 14.8 85.6 ± 14.7 89.2 ± 14.8 0.08
24-hour SBP (mmHg) 136.8 ± 17.3 141.0 ± 18.0 136.2 ± 17.1 0.04
24-hour DBP (mmHg) 80.9 ± 12.5. 78.8 ± 12.9 81.3 ± 12.5 0.13
Use of antihypertensive 316 (74.4%) 45 (77.6%) 271 (73.8%) 0.54
N° antihypertensive drugs (P25%-75%) 1 (1-1) 2 (1-3) 2 (0-3) 0.19
Time Rate SBP index (mmHg/min) 0.476 ± 0.124 0.516 ± 0.146 0.469 ± 0.119 0.007
SD SBP (mmHg) 12.7 ± 3.8 13.2 ± 4.7 12.6 ± 3.7 0.26
CV SBP (%) 9.3 ± 2.7 9.3 ± 2.6 9.3 ± 2.9 0.91