Table 3.
Predicted p5 values for skeletal muscle parameters for different age- and BMI categories in men and women*
| Men | Women | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| BMI (kg/m2) | All BMIs | 17–20 | 20–25 | 25–30 | 30–35 | All BMIs | 17–20 | 20–25 | 25–30 | 30–35 |
| Age (years) | ||||||||||
| SMI (cm2/m2) | ||||||||||
| All ages | 32.8 | 37.9 | 44.0 | 50.1 | 28.6 | 31.3 | 34.5 | 37.5 | ||
| 20–29 | 44.9 | 37.4 | 42.5 | 48.7 | 54.8 | 36.7 | 28.5 | 33.7 | 39.6 | 45.1 |
| 30–39 | 43.4 | 35.9 | 41.0 | 47.2 | 53.3 | 35.3 | 28.7 | 32.8 | 37.6 | 42.2 |
| 40–49 | 41.8 | 34.3 | 39.4 | 45.6 | 51.7 | 33.9 | 28.8 | 31.8 | 35.6 | 39.2 |
| 50–59 | 40.2 | 32.7 | 37.7 | 43.9 | 50.0 | 32.3 | 28.7 | 30.9 | 33.5 | 36.1 |
| 60–69 | 38.6 | 31.0 | 36.1 | 42.3 | 48.4 | 30.7 | 28.5 | 29.9 | 31.4 | 32.9 |
| 70–79 | 36.9 | 29.3 | 34.4 | 40.6 | 46.7 | 28.9 | 28.2 | 28.8 | 29.3 | 29.5 |
| SMA (cm2) | ||||||||||
| All ages | 109.8 | 123.7 | 140.8 | 157.3 | 83.6 | 90.5 | 98.5 | 105.9 | ||
| 20–29 | 153.0 | 131.4 | 145.4 | 162.6 | 179.3 | 111.2 | 88.2 | 102.7 | 119.4 | 134.7 |
| 30–39 | 146.1 | 124.3 | 138.3 | 155.5 | 172.2 | 104.9 | 86.8 | 97.9 | 111.2 | 123.7 |
| 40–49 | 139.0 | 117.1 | 131.2 | 148.3 | 165.0 | 98.3 | 85.1 | 93.1 | 102.9 | 112.3 |
| 50–59 | 131.8 | 109.8 | 123.8 | 141.0 | 157.7 | 91.5 | 83.0 | 88.2 | 94.4 | 100.6 |
| 60–69 | 124.5 | 102.3 | 116.4 | 133.6 | 150.3 | 84.5 | 80.7 | 83.1 | 85.9 | 88.4 |
| 70–79 | 116.9 | 94.8 | 108.8 | 126.0 | 142.7 | 77.3 | 78.0 | 78.0 | 77.3 | 75.9 |
| MRA (HU) | ||||||||||
| All ages | 33.1 | 31.3 | 28.9 | 26.3 | 27.9 | 25.1 | 21.5 | 17.9 | ||
| 20–29 | 35.5 | 39.4 | 37.6 | 35.2 | 32.7 | 34.6 | 38.6 | 36.3 | 33.4 | 30.4 |
| 30–39 | 33.5 | 37.4 | 35.6 | 33.2 | 30.7 | 31.1 | 35.3 | 33.0 | 30.1 | 27.1 |
| 40–49 | 31.4 | 35.4 | 33.6 | 31.2 | 28.7 | 27.5 | 31.9 | 29.7 | 26.8 | 23.8 |
| 50–59 | 29.4 | 33.3 | 31.5 | 29.1 | 26.7 | 23.9 | 28.6 | 26.3 | 23.4 | 20.4 |
| 60–69 | 27.3 | 31.2 | 29.4 | 27.0 | 24.6 | 20.2 | 25.2 | 22.9 | 20.0 | 17.1 |
| 70–79 | 25.1 | 29.1 | 27.3 | 24.9 | 22.5 | 16.6 | 21.7 | 19.5 | 16.6 | 13.7 |
SMI skeletal muscle index, SMA skeletal muscle area, MRA muscle radiation attenuation, HU hounsfield units. BMI body mass index
Predicted p5 values for the age and BMI categories are based on a regression equation, derived from 174 men and 246 women. For each category, the middle value within the category range is used, for instance values for the age category 50–59 years and BMI category 30–35 kg/m2 are predicted values of age 55 years and BMI 32.5 kg/m2. In women, the regression equation for SMI and SMA included an interaction term for age and BMI, because of interaction between these variables in predicting SMI and SMA
*Predicted p10 values are provided as supplementary table (Supplementary Table 2)