Table 1.
Sociodemographic and clinical characteristics of participants
| Characteristics | Total (N=100) | High (N=28) | Low (N=72) | p value (t, χ2) |
|---|---|---|---|---|
| Age | 38.84±13.33 | 39.54±15.12 | 38.57±12.67 | 0.766 (t=0.300) |
| Sex | ||||
| Female | 57 | 12 | 45 | 0.075 (χ2=3.174) |
| Male | 43 | 16 | 27 | |
| Education level | ||||
| Elementary and middle school | 14 | 2 | 12 | 0.463 (χ2=1.542) |
| High school or college/university | 72 | 22 | 50 | |
| Above graduate school | 14 | 4 | 10 | |
| HDRS score | 1.53±1.82 | 1.29±1.51 | 1.63±1.92 | 0.405 (t=-0.837) |
| BIS (total) | 47.20±8.63 | 58.00±4.16 | 43.00±5.78 | <0.001 (t=12.511) |
| BIS (attention) | 13.89±2.46 | 16.32±1.83 | 12.94±1.99 | <0.001 (t=7.805) |
| BIS (motor) | 13.87±3.60 | 18.00±2.31 | 12.26±2.60 | <0.001 (t=10.223) |
| BIS (non-planning) | 19.44±4.02 | 23.68±2.74 | 17.79±3.144 | <0.001 (t=8.703) |
| TICV (cm3) | 1506.53±137.01 | 1516.89±164.22 | 1502.50±125.94 | 0.640 (t=0.470) |
Data are presented as mean±standard deviation for age, HDRS-17 scores, and BIS scores. The p values for the distribution of sex and education level were obtained using a chi-squared test. High group: BIS=53 or higher; Low group: BIS=52 or lower (75%ile score was 53). BIS: Barratt Impulsiveness Scale, HDRS: 17-item Hamilton Depression Rating Scale, TICV: total intracranial cavity volume