Table 3.
Descriptive comparison of tissue properties as measured by pQCT as mean±standard deviation (sd).
| All (n=51) mean±sd | GJH (n=29) mean±sd | JHS (n=22) mean±sd | Mann- Whitney-U p | Mean diff. | Mean diff. % | 95% CI | |||
|---|---|---|---|---|---|---|---|---|---|
| Lower | Upper | ||||||||
| Parameters for thigh | |||||||||
| Total CSA | cm2 | 150.9±28.4 | 151.8±29.7 | 149.8±27.2 | 0.903 | -1.9 | -1.3 | -18.2 | 14.4 |
| mCSA | cm2 | 79.9±10.9 | 80.0±11.3 | 80.0±10.7 | 0.903 | 0.04 | 0.1 | -6.2 | 6.3 |
| Bone CSA | cm2 | 6.0±0.8 | 6.0±0.8 | 6.1±0.8 | 0.419 | 0.1 | 1.7 | -0.4 | 0.6 |
| Fat CSA | cm2 | 63.4±23.1 | 64.2±24.2 | 62.2±22.0 | 0.932 | -2.1 | -3.2 | -15.3 | 11.2 |
| mCSA/bm | mm2/bm | 13.1±1.8 | 13.1±1.9 | 13.1±1.8 | 0.827 | -0.0 | -0.2 | -1.1 | 1.0 |
| Muscle mass | mg | 645±92 | 647±95 | 644±91 | 0.977 | -3 | -0.5 | -56 | 50 |
| Bone mass | mg | 400±44 | 401±43 | 400±47 | 0.676 | -1 | -0.3 | -26 | 24 |
| mDensity | mg/cm3 | 80.6±1.7 | 80.8±1.8 | 80.4±1.6 | 0.962 | -0.5 | -0.6 | -1.4 | 0.5 |
| Bone density | mg/cm3 | 673±70 | 679±68 | 665±75 | 0.515 | -14 | -2.1 | -54 | 26 |
| Parameters for shank | |||||||||
| Total CSA | cm2 | 102.3±16.7 | 102.6±16.4 | 101.7±17.4 | 0.658 | -0.9 | -0.9 | -10.5 | 8.7 |
| Muscle CSA | cm2 | 69.7±10.6 | 69.0±9.5 | 70.5±12.1 | 0.770 | 1.4 | 2.1 | -4.7 | 7.5 |
| Bone CSA | cm2 | 5.7±0.7 | 5.7±0.7 | 5.7±0.7 | 0.655 | -3 | -0.5 | -0.4 | 0.4 |
| Fat CSA | cm2 | 25.6±10.1 | 26.6±11.6 | 24.3±7.9 | 0.917 | -2.3 | -8.6 | -8.1 | 3.5 |
| MCSA/bm | mm2/bm | 11.4±1.6 | 11.3±1.7 | 11.4±1.6 | 0.962 | 0.1 | 1.2 | -0.8 | 1.1 |
| Muscle mass | mg | 564±86 | 560±77 | 568±98 | 0.917 | 8 | 1.4 | -41 | 57 |
| Bone mass | mg | 458±53 | 459±55 | 456±51 | 0.962 | -3 | -0.7 | -33 | 27 |
| mDensity | mg/cm3 | 81.0±1.6 | 81.2±1.7 | 80.7±1.4 | 0.517 | -0.5 | -0.6 | -1.4 | 0.4 |
| Bone density | mg/cm3 | 808±54 | 808±46 | 808±64 | 0.970 | -0 | 0.1 | -30 | 31 |
pQCT = Peripheral Quantitative Computer Tomgraphy, GJH = Generalized Joint Hypermobility, JHS = Joint Hypermobility Syndrome, diff = difference, CI = Confidence Interval, CSA = Cross-sectional area, mCSA = muscle cross-sectional area, mDensity = Muscle density, bm = body mass.