Table 1.
Demographic, psychopathological, and experimental characteristics of the two samples. Percentages, means, and standard deviations (in brackets).
| Traditional variant (n = 961) | Extended variant (n = 938) | Statistics | |
|---|---|---|---|
| Demographics | |||
| Gender (female/male) | 61%/39% | 60%/40% | χ 2(1) = 0.74; P > .7 |
| Age in years | 43.15 (15.72) | 43.00 (15.12) | t(1897) = 0.24; P > .8 |
| Educational level (below 13th grade/13th grade/university degree) | 35%/27%/38% | 37%/26%/37% | χ 2(1) = 0.29; P > .8 |
| Paranoia Checklist | |||
| Total score | 26.44 (11.67) | 26.88 (11.32) | t(1897) = 0.82; P > .4 |
| Unspecific suspiciousness (regression score; see factor analysis) | −.02 (1.00) | .02 (.99) | t(1897) = 0.81; P > .4 |
| Psychotic paranoia (regression score) | −.00 (1.01) | .01 (.99) | t(1897) = 0.29; P > .7 |
| Probabilistic reasoning | |||
| JTC (1st fish) | 37% | 66% | χ 2(1) = 163.98; P < .001 |
| JTC (1st or 2nd fish) | 52% | 74% | χ 2(1) = 99.63; P < .001 |
| Draws to decision | 3.13 (2.56) | 2.18 (2.29) | t(1897) = 8.49; P < .001 |
| Decision threshold in % | — | 73.93% (19.56) | — |
Note. JTC: jumping to conclusions.