Table 1.
Demographic and Clinical Characteristics of Study Participants
| Group | ||||||
|---|---|---|---|---|---|---|
|
| ||||||
| Healthy Controls (CON) | Siblings of Controls (SCN) | Siblings of Schizophrenia (SIB) | ||||
|
| ||||||
| Measure | Mean | SD | Mean | SD | Mean | SD |
| Age | 20.79 | 3.72 | 20.16 | 3.94 | 21.51 | 3.63 |
| Gender (% male) | 51% | 35% | 47% | |||
| Race Distribution | ||||||
| % Caucasian | 69% | 70% | 59% | |||
| % African-American | 30% | 29% | 41% | |||
| % Asian | 1% | 1% | 0% | |||
| Education | 12.81 | 2.72 | 12.42 | 3.01 | 12.45 | 2.84 |
| Parental Education | 14.74 | 2.03 | 14.64 | 2.04 | 14.70 | 2.80 |
| Negative Symptoms*1 | −.39 | .28 | −0.30 | .40 | −0.10 | .51 |
| Positive Symptoms*b | −.41 | .36 | −0.31 | .36 | −0.21 | .36 |
| Disorganization Symptoms*c | −.33 | .25 | −0.29 | .29 | −0.14 | .42 |
*
Symptom scores are reported in Z scores relative to the mean of a sample that included the probands with schizophrenia. See Methods for details.
a
SIB < CON, SCN at p<.01, CON=SCN
b
SIB < CON, SCN at p<.05, CON=SCN
c
SIB < CON at p<.01, CON=SCN