Table 1.
Baseline Characteristics of Study Participants Total and According to the RDW Category
| Total | RDW (min-13.0%) | RDW (13.1%–14.0%) | RDW (14.1%–15.0%) | RDW (15.1%–max) | p Trend | |
|---|---|---|---|---|---|---|
| n | 3635 | 370 | 1449 | 1120 | 696 | |
| Age (years) | 79.1 (5.1) | 78.2 (5.0) | 78.8 (4.9) | 79.4 (5.2) | 79.9 (5.4) | <0.001 |
| BMI (kg/m2) | 27.1 (3.9) | 26.9 (3.6) | 27.1 (3.7) | 27.0 (3.9) | 27.5 (4.3) | 0.05 |
| Hemoglobin (g/dL) | 14.1 (1.4) | 14.4 (1.2) | 14.4 (1.2) | 14.1 (1.3) | 13.3 (1.6) | <0.001 |
| Femoral neck BMD (g/cm2) | 0.77 (0.13) | 0.77 (0.14) | 0.77 (0.12) | 0.77 (0.14) | 0.78 (0.15) | 0.57 |
| Total hip BMD (g/cm2) | 0.94 (0.15) | 0.95 (0.14) | 0.94 (0.14) | 0.94 (0.15) | 0.95 (0.16) | 0.44 |
| Prevalent fracture, n (%) | 342 (9.4%) | 25 (6.8%) | 113 (7.8%) | 136 (12.1%) | 68 (9.8%) | <0.001 |
| Falls in the past 12 months, n (%) | 1097 (30.2%) | 96 (25.9%) | 416 (28.7%) | 329 (29.4%) | 256 (36.8%) | 0.005 |
| History of CVD, n (%) | 853 (23.5%) | 75 (20.3%) | 289 (19.9%) | 268 (23.9%) | 221 (31.8%) | <0.001 |
RDW = red cell distribution width; BMI = body mass index; BMD = bone mineral density; CVD = cardiovascular diseases.
Data were shown as mean (SD) for continuous variables or n (%) for categorical variables, except RDW of median (min–max).
The p trend was analyzed by Cochran-Armitage test or Cuzick’s test.