Table 4. Rate of change (%/decade) cross adulthood for CSAIMAT, CSAmuscle, IMAT% by QCT with adjustment for height and weight.
| Variable | 20–29 years (n=69), mean ± SD | %change 30–39 years (n=127) | %change 40–49 years (n=140) | %change 50–59 years (n=88) | %change 60–69 years (n=67) | %change 70–79 years (n=25) | %change 20–79 years | Absolute change between 20 and 79 years |
|---|---|---|---|---|---|---|---|---|
| CSAIMAT (cm2) | 3.44±0.28 | +2.0 | +21.1** | +28.2*** | +42.9*** | +38.0*** | +212.5 | +7.31 |
| CSAmuscle (cm2) | 38.96±0.67 | +2.7 | −1.5 | −2.4 | −8.7*** | −8.0* | −17.1 | −6.67 |
| IMAT% (%) | 7.95±0.59 | −0.4 | +22.5** | +30.0*** | +41.5*** | +39.7*** | +213.5 | +16.97 |
*P value <0.05, **P value <0.01, ***P value <0.001. BMI, body mass index; IMAT, intermuscular adipose tissue; CSA, cross-sectional area. IMAT% referred to CSAIMAT / (CSAIMAT + CSAmuscle) as fatty infiltration ratio of muscle.