Table 1.
Participant Characteristics, Neuropsychological Variables, and Predictors in Study 1
| Measure | a-MDD (n = 27) M (SD) |
HC (n = 27) M (SD) |
t | p |
|---|---|---|---|---|
| Gender (% female) | 74.1 | 77.8 | χ2 = 0.101 | 0.75 |
| Age | 27.07 (6.73) | 30.96 (10.17) | 1.66* | 0.11 |
| Educationa | 15.80 (1.63) | 15.31 (1.74) | −1.04 | 0.30 |
| Shipley Estimated IQa | 111.58 (6.31) | 102.28 (23.98) | −1.63 | 0.11 |
| HAM-Da | 18.48 (4.24) | 0.15 (0.46) | −21.48* | <0.001 |
| HAM-Aa | 18.55 (7.69) | 0.16 (0.50) | −11.19* | <0.001 |
| No. of Depressive Episodesb | 4.30 (6.67) | 0.00 (0.00) | −2.89* | 0.009 |
| BAS-RRc | 15.38 (2.97) | 17.00 (1.59) | 2.13* | 0.04 |
| BISc | 23.90 (3.85) | 17.19 (3.02) | −5.76 | <0.001 |
| BAS-Dc | 8.76 (2.33) | 11.31 (1.40) | 3.85 | <0.001 |
| Go Target Reaction Time (ms)b | 438.79 (47.19) | 409.54 (32.12) | −1.96 | 0.06 |
| Go Target Accuracy (%)b | 0.95 (0.06) | 0.98 (0.03) | 1.65* | 0.12 |
| Digit Span (scaled) a | 10.86 (2.64) | 11.0 (3.02) | 0.15 | 0.88 |
| Digit Symbol (scaled) a | 11.35 (3.30) | 13.44 (2.89) | 2.07 | 0.05 |
| Purdue Pegboard (right hand) (s) a | 14.55 (4.110) | 15.50 (2.33) | 0.61 | 0.55 |
*
Levene’s test indicated equal variances not assumed.
a
Missing data for up to 9 participants per group.
b
Missing data for 13 a-MDD participants.
c
Sample size reduced because not all participants completed the BIS/BAS (a-MDD = 21, HC = 16)