TABLE 1.
Sample Description (N = 508; Observations = 1178)
| Premutation | Full Mutation | |||
|---|---|---|---|---|
| No. Children | No. Observations | No. Children | No. Observations | |
| n = 69 | n = 167 | n = 439 | n = 1011 | |
| Sex, n (%) | ||||
| Female | 34 (49.3) | 106 (63.5) | 94 (21.4) | 226 (22.4) |
| Male | 35 (50.7) | 61 (36.5) | 345 (78.6) | 785 (77.6) |
| Race, n (%) | ||||
| White | 26 (37.7) | 77 (46.1) | 171 (39.0) | 459 (45.4) |
| Black | 6 (8.7) | 19 (11.4) | 11 (2.5) | (31 (3.1) |
| Asian | 1 (1.4) | 1 (0.6) | 5 (1.1) | 13 (1.3) |
| Hispanic | 2 (2.9) | 9 (5.4) | 4 (0.9) | 5 (0.5) |
| Other | 3 (4.3) | 9 (5.4) | 16 (3.6) | 54 (5.3) |
| Missing | 31 (44.9) | 52 (31.1) | 232 (52.8) | 449 (44.4) |
| Age at baseline, mo, mean (SD) | 23.0 (14.2) | 23.4 (16.1) | 34.8 (14.5) | 33.7 (17.9) |
| No. observations, mean (SD) | 2.4 (1.6) | — | 2.3 (1.4) | — |
| No. with 1 visit, n (%) | 29 (42.0) | — | 163 (37.1) | — |
| Test-retest interval, in mo | ||||
| Mean (SD) | — | 9.9 (8.4) | — | 12.1 (7.6) |
| Minimum–maximum | — | 1–49 | — | 1–45 |
—, not applicable.