Table 1.
Decisional capacity scores and quality of consent ratings by diagnosis and consent condition
| NC Group (n=16) | Schizophrenia Group (n=19) | |||||||
|---|---|---|---|---|---|---|---|---|
| Variable | Routine (n=8) | Enhanced (n=8) | Test Statistic | p-value | Routine (n=9) | Enhanced (n=10) | Test Statistic | p-value |
| Age in years, mean (SD) | 52.5 (12.1) | 48.6 (15.9) | t14=0 .55 | 0.59 | 57.0 (10.0) | 57.9 (8.9) | t17= -0.12 | 0.90 |
| Education in years, mean (SD) | 14.9 (1.6) | 16.0 (1.9) | t14=-1.29 | 0.22 | 12.4(0.9) | 11.8 (1.9) | t17= 0.92 | 0.37 |
| Gender, % women | 50.0 | 62.5 | X2= 0.25 | 0.61 | 11.0 | 40.0 | X2= 2.04 | 0.15 |
| Ethnic minorities (%) | 25.0 | 25.0 | X2= 1.33 | 0.51 | 22.2 | 30.0 | X2= 0.95 | 0.81 |
| UBACC total (potential range 0-20) | 19.6 (0.7) | 20.0 (0.0) | U = 24.00 | 0.14 | 15.0 (3.5) | 18.2 (3.3) | U = 19 | 0.03 |
| MacCAT- CR | ||||||||
| Understanding (potential range 0-26) | 25.0 (1.5) | 25.1 (1.6) | U = 22.00 | 0.71 | 15.3 (6.9) | 20.5 (5.9) | U = 25 | 0.10 |
| Appreciation (potential range 0-6) | 6.0 (0.0) | 5.7 (0.6) | U = 21.00 | 0.31 | 4.8 (1.0) | 5.2 (1.4) | U = 32.5 | 0.25 |
| Reasoning (potential range 0-8) | 7.4 (1.0) | 7.6 (1.5) | t12 = -0.34 | 0.74 | 5.6 (2.0) | 6.3 (0.9) | t17= -1.05 | 0.31 |
| Expression of a choice (potential range 0-2) | 2.0 (0.0) | 2.0 (0.0) | U = 24.50 | 1.00 | 2.0 (0.0) | 1.9 (0.3) | U = 40.5 | 0.34 |
| Quality of consent relative to past experience | ||||||||
| Better | 17% | 60% | N/A | N/A | 25% | 44% | N/A | N/A |
Note. UBACC= UCSD Brief Assessment of Capacity to Consent; MacCAT-CR= MacArthur Competence Assessment Tool for Clinical Research