Table I. — Baseline characteristics of the 162 participants.
| All (324 case knees from 162 participants) |
Analyzed (158 case knees from 79 participants) |
Dropped (166 case knees from 83 participants) |
P value | |
|---|---|---|---|---|
| Demographics | ||||
| Age (years) | 65.8±4.0 | 65.6±4.1 | 66.0±3.9 | 0.471 |
| Gender (females: males) | 99: 63 | 46: 33 | 53: 30 | 0.463 |
| BMI (kg/m2) | 23.2±3.4 | 23.4±3.5 | 23.1±3.3 | 0.556 |
| Activity level (N. of sedentary) | 83 | 40 | 43 | 0.881 |
| † Number of comorbidities (N. of participants) | 0: 92 1: 44 >1: 26 |
0: 44 1: 21 >1: 14 |
0: 48 1: 23 >1: 12 |
0.700 |
| Passive stiffness (kPa) | ||||
| Total superficial quadriceps | 20.7 (6.5) | 20.4 (5.9) | 20.9 (7.1) | 0.355 |
| Rectus femoris | 10.5 (4.7) | 10.4 (4.5) | 10.6 (5.2) | 0.557 |
| Vastus lateralis | 5.4 (2.0) | 5.3 (1.9) | 5.5 (2.2) | 0.556 |
| Vastus medialis oblique | 4.4 (1.2) | 4.5 (1.3) | 4.4 (1.2) | 0.510 |
| Strength (Nm/kg) | ||||
| Quadriceps | 1.28±0.36 | 1.27±0.36 | 1.28±0.36 | 0.765 |
| Hamstrings | 0.61±0.20 | 0.63±0.21 | 0.59±0.18 | 0.080 |
Values are mean±SD, numbers or median (interquartile range) unless other indicates. †Including hypertension, diabetes, cardiopulmonary disease, and dyslipidemia.