Table 1.
Characteristics of study population.
| Sex, n (%) | (N = 39) |
| Male | 22 (56.4%) |
| Female | 17 (43.6%) |
| Age, years | (N = 39) |
| Mean | 15.3 |
| SD | 12.2 |
| Median | 13 |
| Minimum | 0 |
| Maximum | 41 |
| Race/ethnicity, n (%) | (N = 35) |
| Asian | 3 (8.6%) |
| Black, African American | 6 (17.1%) |
| Caucasian Hispanic or Latino | 4 (11.4%) |
| Caucasian not Hispanic or Latino | 19 (54.3%) |
| Other | 1 (2.8%) |
| Multiple races or ethnicities | 2 (5.7%) |
| Plasma leucine level at diagnosis (μmol/L), n (%) | (N = 20) |
| < 154 | 1 (5.0%) |
| 154–308 | 1 (5.0%) |
| 309–462 | 1 (5.0%) |
| 463–769 | 2 (10.0%) |
| 770–1077 | 2 (10.0%) |
| 1078–1538 | 2 (10.0%) |
| > 1538 | 11 (55.0%) |