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Demographic characteristics of the 67 study volunteers.
| Variable | Mean | SD | Range |
|---|---|---|---|
| Age (years) | 41.2 | 12.5 | 19, 74 |
| Education (years) | 14.7 | 2.3 | 11, 20 |
| Sex (% men) | 55.2 | -- | -- |
| Handedness (% right) | 83.6 | -- | -- |
| Ethnicity (%) | -- | -- | -- |
| Caucasian | 58.2 | -- | -- |
| African-American | 31.3 | -- | -- |
| Hispanic | 6.0 | -- | -- |
| Other | 4.5 | -- | -- |
Note. SD = standard deviation.
