Table 2.
Raw Means and Standard Errors of Brief Symptom Inventory Scores and Hierarchial Linear Model Results with Within-Group Slope Estimates Representing Main Effects of Time.
| Outcome variable Group | Raw scores | β1 Coefficient | Standard error | T ratio (df = 391) | p < | ||||
|---|---|---|---|---|---|---|---|---|---|
| Baseline | Month 1 | Month 3 | Month 6 | Month 9 | |||||
| Global Symptom Index | |||||||||
| Standard care | .87 ± .69 | .71 ± .72 | .73 ± .81 | .71 ± .76 | .75 ± .80 | −0.000230* | 0.000268 | −0.86 | .39 |
| CM | .90 ± .71 | .64 ± .63 | .72 ± .75 | .65 ± .66 | .57 ± .65 | −0.000940 | 0.000184 | 5.12 | .001 |
| Somatization | |||||||||
| Standard care | .58 ± .69 | .56 ± .72 | .57 ± .75 | .53 ± .67 | .56 ± .64 | −0.000097 | 0.000269 | −0.36 | .72 |
| CM | .60 ± .68 | .47 ± .66 | .55 ± .29 | .51 ± .66 | .49 ± .68 | −0.000249 | 0.000190 | −1.32 | .19 |
| Obsessive-compulsive | |||||||||
| Standard care | 1.11 ± .91 | .94 ± .88 | .87 ± .94 | .84 ± .94 | .95 ± .98 | −0.000477 | 0.000321 | −1.49 | .14 |
| CM | 1.13 ± .95 | .80 ± .82 | .91 ± .94 | .78 ± .84 | .71 ± .81 | −0.001156 | 0.000226 | −5.12 | .001 |
| Interpersonal sensitivity | |||||||||
| Standard care | .99 ± .92 | .74 ± .93 | .81 ± 1.02 | .76 ± .96 | .81 ± 1.02 | −0.000310* | 0.000357 | −0.87 | .39 |
| CM | 1.04 ± .99 | .69 ± .86 | .77 ± 1.09 | .69 ± .83 | .61 ± .84 | −0.001242 | 0.000225 | −5.53 | .001 |
| Depression | |||||||||
| Standard care | 1.01 ± .94 | .77 ±.93 | .82 ± .99 | .81 ± 1.01 | .85 ± 1.05 | −0.000137* | 0.000358 | −0.38 | .70 |
| CM | 1.05 ± .89 | .70 ± .80 | .79 ± .93 | .72 ± .87 | .62 ± .79 | −0.001152 | 0.000240 | −4.80 | .001 |
| Anxiety | |||||||||
| Standard care | .84 ± .80 | .70 ± .84 | .71 ± .93 | .69 ± .86 | .69 ± .80 | −0.000372 | 0.000301 | −1.236 | .22 |
| CM | .92 ± .89 | .67 ± .85 | .70 ± .83 | .63 ± .77 | .55 ± .79 | −0.001040 | 0.000218 | −4.76 | .001 |
| Hostility | |||||||||
| Standard care | .63 ± .76 | .64 ± .86 | .68 ± .87 | .63 ± .82 | .73 ± .91 | 0.000294* | 0.000352 | 0.84 | .40 |
| CM | .78 ± .79 | .60 ± .72 | .68 ± .81 | .59 ± .70 | .55 ± .72 | −0.000648 | 0.000201 | −3.23 | .002 |
| Phobic anxiety | |||||||||
| Standard care | .62 ± .72 | .52 ± .69 | .50 ± .72 | .52 ± .73 | .60 ± .85 | 0.000054* | 0.000274 | 0.20 | .84 |
| CM | .64 ± .79 | .44 ± .65 | .49 ± .69 | .44 ± .66 | .36 ± .62 | −0.000832 | 0.000186 | −4.47 | .008 |
| Paranoid ideation | |||||||||
| Standard care | 1.05 ± .84 | .81 ± .86 | .81 ± .95 | .80 ± .90 | .79 ± .92 | −0.000634 | 0.000327 | −1.94 | .05 |
| CM | 1.01 ± .83 | .76 ± .79 | .84 ± .94 | .77 ± .84 | .67 ± .84 | −0.000969 | 0.000227 | −4.27 | .001 |
| Psychoticism | |||||||||
| Standard care | .89 ± .82 | .69 ± .88 | .71 ± .93 | .70 ± .90 | .76 ± .95 | −0.000201* | 0.000325 | −062 | .54 |
| CM | .93 ± .87 | .63 ± .79 | .72 ± .92 | .62 ± .76 | .50 ± .73 | −0.001253 | 0.000218 | −5.75 | .001 |
Note. CM = Contingency management. β1 coefficient = γ10 for the CM condition when coded 0 (and standard care coded 1); β1 coefficient = γ10 for the standard care condition when coded 0 (and CM coded 1); β1coefficients indicate the rate of change in scores per day from baseline through Month 9.
*
= slopes are significantly different between treatment conditions, p < .05.