Table 3.
Anatomical variation of proton density fat fraction (PDFF) values for each age group and sex.
| PDFF L1 (%) |
PDFF L2 (%) |
PDFF L3 (%) |
PDFF L4 (%) |
|||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Male |
Female |
Male |
Female |
Male |
Female |
Male |
Female |
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| Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | Mean | SD | |
| Twenties | 33.9 | 16.2 | 25.7 | 5.9 | 30.9 | 8.4 | 26.3 | 5.9 | 31.3 | 5.8 | 27.6 | 6.4 | 32.2 | 5.6 | 29.3 | 6.5 |
| Thirties | 34.4 | 7.2 | 23.8 | 3.8 | 33.8 | 7.0 | 26.4 | 5.3 | 35.1 | 6.8 | 27.4 | 6.0 | 37.5 | 6.9 | 29.5 | 7.0 |
| Forties | 40.8 | 22.8 | 32.3 | 7.1 | 41.3 | 21.4 | 33.8 | 6.8 | 35.6 | 9.7 | 34.0 | 6.3 | 35.1 | 7.9 | 39.3 | 8.5 |
| Fifties | 40.8 | 6.4 | 39.0 | 9.4 | 42.1 | 7.2 | 38.8 | 9.4 | 42.6 | 5.3 | 40.6 | 10.5 | 42.7 | 6.0 | 43.6 | 10.6 |
| Sixties | 37.1 | 3.7 | 47.1 | 8.6 | 37.,6 | 4.6 | 47.3 | 8.3 | 40.4 | 7.8 | 48.7 | 8.2 | 40.7 | 6.9 | 52.2 | 7.5 |
| Seventies | 39.5 | 12.4 | 45.4 | 9.9 | 40.4 | 9.8 | 48.9 | 9.1 | 44.5 | 6.3 | 51.9 | 7.8 | 48.7 | 5.7 | 54.3 | 8.7 |
| Relative age-related PDFF change (%) |
16.7 (p = 0.730) |
76.8 (p < 0.001) |
31.0 (p = 0.100) |
85.8 (p < 0.001) |
42.3 (p = 0.002) |
88.3 (p < 0.001) |
51.4 (p = 0.001) |
85.7 (p < 0.001) |
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Relative age-related PDFF change was computed at each vertebral level as: (PDFF seventies − PDFF twenties)/PDFF twenties. Bold p-values indicate significantly (p < 0.05) different PDFF values through the five age groups at respective vertebral level.