TABLE 2.
Experiment 1: Effects of shadow on completion time
| Primary outcome: Completion time | |||||||
|---|---|---|---|---|---|---|---|
| Geometric mean in seconds a (95% CI) | Percentage reduction in completion time (95% CI) | ||||||
| Group | High Shadow | Medium Shadow | No Shadow | Global test b | Medium Shadow vs High | No Shadow vs High | No Shadow vs Medium |
| PCA (N = 10) | 10.4 (8.9, 12.3) | 9.9 (8.4, 11.7) | 9.7 (8.2, 11.4) | P = .01 | 4.9% (–0.6, 10.0) | 7.1% (2.5, 11.5) | 2.3% (–2.5, 6.9) |
| tAD (N = 9) | 6.6 (5.9, 7.5) | 6.7 (6.0, 7.6) | 6.6 (5.9, 7.5) | P = .77 | –2.1% (‐8.9, 4.2) | –0.3% (‐6.0, 5.1) | 1.8% (–3.8, 7.1) |
| Controls (N = 12) | 5.5 (5.1, 5.9) | 5.5 (5.1, 5.9) | 5.4 (5.1, 5.8) | P = .33 | 0.0% (–1.8, 1.7) | 0.9% (–0.6, 2.4) | 0.9% (–0.6, 2.4) |
Estimated geometric means and percentage reduction in completion time results for PCA, tAD, and control groups.
Abbreviations: PCA, posterior cortical atrophy; tAD, typical Alzheimer's disease.
a
Geometric mean is the exponentiated mean of the estimated log transformed completion times.
b
Global test of the null hypothesis that within a participant group there is no difference between completion times under the three shadow conditions.