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Summary of demographic variables for participants
| POC | Healthy participants | |
| n | 6 | 8 |
| Mean age (range) | 53 (49–59) | 41 (18–60) |
| N (males/females) | 2/4 | 5/3 |
| Mean IQ* (SD) | 111 (16) | 115 (11) |
The two groups did not differ in any of these measures (p > 0.05). POC, presumed obligate carriers.
*As measured by the revised Wechsler Adult Intelligence Scale (WAIS-R), short version.
