Table 5.
Candidate predictors for regression models in Q -learning
| Variable | Description | Abbreviation | Type | Values (range or level) | Mean (SD) or frequency ( % ) |
|---|---|---|---|---|---|
| Age | Age at entry (years) | AGE | Numerical | 18–77 | 40.59 (11.74) |
| Race | Race | RACE | Binary | White or Causasian, non-White | 90.4%, 9.6% |
| Gender | Gender | GENDER | Trinary | Male, female, transgender | 43%, 56%, 1% |
| Marriage | Marital status | MARSTAT | Trinary | Never married, married, | 35.6%, 33.8%, 30.6% |
| separated | |||||
| Household Income | Annual household income | HINCOME | Binary | <40, ≥40 | 58.5%, 41.5% |
| (×$1000) | |||||
| Employment | Employment status | EMPLOY | Binary | Employed, unemployed | 46.9%, 53.1% |
| Education | Education level | EDUCATE | Binary | College or below, technical | 53%, 47% |
| school or above | |||||
| Insurance | Indicator of medical insurance | MEDINS | Binary | Yes, no | 72.8%, 27.2% |
| Bipolar Type | Bipolar type at entry | BITYPE | Binary | Type I, type II | 70.4%, 29.6% |
| Prior Episode | Clinical episode immediately | PRONSET | Trinary | Remission, (hypo)manic, | 45.9%, 33.2%, 20.9% |
| preceding current depressive | mixed | ||||
| episode | |||||
| SUMD0 | Scaled depression at entry | SUMD0 | Numerical | 0.75–18 | 7.47 (2.30) |
| SUMD1 a | Scaled depression at the end | SUMD1 | Numerical | 0–14 | 4.49 (3.07) |
| of stage 1 | |||||
| SUMM0 | Scaled mood elevation at entry | SUMM0 | Numerical | 0–7 | 1.19 (1.09) |
| SUMM1 a | Scaled mood elevation at the | SUMM1 | Numerical | 0–6.75 | 0.95 (1.30) |
| end of stage 1 | |||||
| Treatment 1 a | Treatment received at stage 1 | Trt1 | Trinary | Bupropion, Paroxetine, | 23.3%, 25.5%, 51.2% |
| placebo | |||||
| Side 1 | Tremor | SIDE1 | Binary | Yes, no | 26.9%, 73.1% |
| Side 2 | Dry mouth | SIDE2 | Binary | Yes, no | 21.1%, 78.9% |
| Side 3 | Sedation | SIDE3 | Binary | Yes, no | 17.1%, 82.9% |
| Side 4 | Constipation | SIDE4 | Binary | Yes, no | 5.7%, 94.3% |
| Side 5 | Diarrhea | SIDE5 | Binary | Yes, no | 12%, 88% |
| Side 6 | Headache | SIDE6 | Binary | Yes, no | 13.7%, 86.3% |
| Side 7 | Poor memory | SIDE7 | Binary | Yes, no | 14.3%, 85.7% |
| Side 8 | Sexual dysfunction | SIDE8 | Binary | Yes, no | 9.7%, 90.3% |
| Side 9 | Increased appetite | SIDE9 | Binary | Yes, no | 12.6%, 87.4% |
aThose that are only available for the second-stage regression model.