Table 1.
Characteristics of the sample
| Variable | All (N = 157) | MDD (n = 78) | HC (n = 79) | t or χ2 |
|---|---|---|---|---|
| Age (years) | 32 (1) | 33 (10) | 31 (10) | 1.40 (155) |
| Sex | 2.93 | |||
| (Female/male) | 91/66 | 51/27 | 40/39 | (1) |
| SRA | ||||
| Caucasian | 120 | 59 | 61 | 1.09 (5) |
| African-American | 12 | 6 | 6 | |
| Native American | 4 | 3 | 1 | |
| Native Hawaiian/Pacific Islander | 2 | 1 | 1 | |
| Asian American | 4 | 2 | 2 | |
| Other | 15 | 7 | 8 | |
| Occupational status | ||||
| Employed full time | 55 | 25 | 30 | 7.62 (7) |
| Employed part time | 19 | 11 | 8 | |
| Homemaker | 5 | 1 | 4 | |
| Full-time student | 34 | 11 | 23 | |
| Unemployed less than 6 months, but expects to work | 7 | 4 | 3 | |
| Unemployed 6 months or more, but expects to work | 1 | 1 | 0 | |
| Unemployed 6 months or more and does not expect to work | 1 | 1 | 0 | |
| Other | 2 | 1 | 1 | |
| Educational status | ||||
| Some high school | 3 | 1 | 2 | 10.39 (5) |
| High school graduate | 11 | 8 | 3 | |
| Some college/technical school | 62 | 32 | 30 | |
| College graduate | 37 | 12 | 25 | |
| Masters or above | 10 | 2 | 8 | |
| Other | 1 | 0 | 1 | |
| Smoking status | ||||
| Non-smoker | 111 | 46 | 65 | 4.52* (1) |
| Smoker | 14 | 10 | 4 | |
| BMI | 28.1 (6.43) | 29.3 (6.81) | 26.9 (5.85) | 2.33* (155) |
| MADRS | 11.7 (11.76) | 22.2 (7.99) | 1.8 (2.45) | 21.49** (150) |
Values enclosed in the parenthesis represent standard deviations (under “All,” “MDD,” and “HC”) or degrees of freedom (under “t or χ2”). The variables of SRA, occupational status, and educational status contained missing values
HC healthy controls, SRA self-reported ancestry, BMI body mass index, MADRS total score on Montgomery-Åsberg Depression Rating Scale
*p < 0.05; **p < 0.01