Table 1.
Baseline Characteristics of Subjects Aged at Least 65 Years
| Slow gait speeda | ||||
|---|---|---|---|---|
| Overall (N = 970) | With (n = 217) | Without (n = 753) | p | |
| Gait speed (m/s) | 0.98 (0.29) | 0.58 (0.17) | 1.09 (0.19) | <.0001 |
| Slow gait speed | 217/970 (22.4) | n/a | n/a | n/a |
| Low 25(OH)Db | 587/930 (63.1) | 167 (81.5) | 420 (57.9) | <.0001 |
| High IL-6c | 487/959 (50.8) | 150 (70.8) | 337 (45.1) | <.0001 |
| Low IGF-1d | 476/940 (50.6) | 138 (65.4) | 338 (46.4) | <.0001 |
| High CRPe | 434/960 (45.2) | 115 (54.0) | 319 (42.7) | .004 |
| Age (years) | 74.6 (7.1) | 80.7 (7.5) | 72.8 (5.9) | <.0001 |
| Male gender | 430/970 (44.3) | 60 (27.7) | 370 (49.1) | <.0001 |
| Body mass index (kg/m2) | 27.5 (4.1) | 28.1 (4.8) | 27.3 (3.9) | .03 |
| Greve site | 450/970 (46.4) | 108 (49.8) | 342 (45.4) | .26 |
| No education | 277/970 (28.6) | 107 (49.3) | 170 (22.6) | <.0001 |
| Diabetes mellitus | 130/970 (13.4) | 41 (18.9) | 89 (11.8) | .02 |
| PAD | 172/970 (17.7) | 62 (28.6) | 110 (14.6) | <.0001 |
| Angina pectoris | 85/970 (8.8) | 33 (15.2) | 52 (6.9) | <.0001 |
| Heart failure | 238/970 (24.5) | 84 (38.7) | 154 (20.5) | <.0001 |
| Stroke or TIA | 71/970 (7.3) | 35 (16.1) | 36 (4.8) | <.0001 |
| COPD | 111/970 (11.4) | 27 (12.4) | 84 (11.2) | .87 |
| Physical activityf | 368/966 (38.1) | 23 (10.7) | 345 (46.0) | <.0001 |
| Daily vitamin D intake (µg) | 1.83 (0.85) | 1.67 (0.72) | 1.88 (0.88) | .0006 |
Note: Categorical variables summarized by frequencies (percentages) and tested by chi-squared test., continuous variables by means (standard deviations) and tested by two-sample t test. COPD = Chronic obstructive pulmonary disease; PAD = Peripheral arterial disease; TIA = Stroke or transient ischemic attack.
a<0.8 m/s;
b<20 ng/mL;
c≥2.87 pg/mL;
d<112 ng/mL;
e≥3 mg/L;
fLight exercise >4 h/wk or moderate exercise ≥1 h/wk in the last year.