Table 1.
Baseline characteristics of MrOs sample (n = 475)
| |
Full sample mean (SD) |
Stratified by BMI mean (SD) |
||
|---|---|---|---|---|
| BMI < 30 (n = 399) | BMI ≥30 (n = 76) | p-value for difference a | ||
| Age (years) |
74.2 (5.86) |
74.7 (5.86) |
71.6 (5.09) |
<.001 |
| Cobb angle of kyphosis (degrees) |
37.5 (11.90) |
37.9 (12.0) |
35.2 (11.3) |
.07 |
| Height (cm) |
173.6 (6.97) |
173.7 (7.19) |
172.9 (5.72) |
.28 |
| Total hip BMD (g/cm2) |
0.94 (0.14) |
0.92 (0.14) |
1.01 (0.13) |
<.001 |
| BMI (kg/m2) |
26.8 (3.21) |
25.8 (2.37) |
32.0 (1.54) |
<.001 |
| Prevalent vertebral fracture (% yes) |
9.68 |
10.5 |
5.26 |
0.16 |
| Total paraspinal muscle volume (cm3) |
18.6 (3.79) |
18.7 (3.69) |
18.0 (4.28) |
0.15 |
| Paraspinal muscle volume (cm3) |
12.1 (3.47) |
12.3 (3.42) |
11.4 (3.64) |
0.04 |
| Paraspinal muscle attenuation (HU) |
43.6 (5.48) |
43.5 (5.40) |
43.9 (5.91) |
0.57 |
| Paraspinal adipose tissue volume (cm3) |
6.41 (2.61) |
6.36 (2.65) |
6.62 (2.37) |
0.43 |
| Total psoas muscle volume (cm3) |
11.1 (2.65) |
11.1 (2.58) |
10.7 (2.98) |
0.15 |
| Psoas muscle volume (cm3) |
10.0 (3.16) |
10.2 (2.99) |
8.82 (3.76) |
.003 |
| Psoas muscle attenuation (HU) |
51.53 (5.13) |
51.64 (5.43) |
50.98 (3.05) |
0.14 |
| Psoas adipose tissue volume (cm3) |
1.07 (0.91) |
0.92 (0.77) |
1.85 (1.15) |
< .001 |
| Total abdominal muscle volume (cm3) |
63.9 (8.11) |
63.5 (7.82) |
65.8 (9.29) |
.048 |
| Abdominal muscle volume (cm3) |
48.3 (10.3) |
48.9 (9.82) |
45.2 (12.0) |
.01 |
| Abdominal muscle attenuation (HU) |
45.79 (4.36) |
45.84 (4.54) |
45.56 (3.30) |
0.53 |
| Abdominal adipose tissue volume (cm3) | 15.6 (6.01) | 14.6 (5.50) | 20.6 (6.14) | < .001 |
ap-value represents t-test (for continuous variables) or Chi-square test (for categorical variables) for difference between those with BMI < 30 kg/m2 versus those with BMI ≥ 30 kg/m2.
cm = centimeters; cm3 = centimeters3; g/cm2 = grams/centimeter2; kg/m2 = kilograms/meter2; HU = Hounsfield units.