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Demographic characteristics of the participants
| Asymptomatic carriers | Controls | |
| Age (y) | 47.7 (8.6) | 45.6 (8.2) |
| Education (y) | 13.0 (3.5) | 12.2 (3.6) |
| IQ | 107.6 (14.2) | 109.3 (11.2) |
| Socioeconomic status | 37.6 (5.3) | 36.7 (5.6) |
Data are mean (SD). Student's t tests (two-tailed) revealed no significant differences between carriers and controls (P > 0.6).
