TABLE 3.
Experiment 2: Effects of localized lighting on completion time and walking path straightness index (SI): (A) Estimated geometric means and percentage reduction in completion time results; (B) estimated walking path SI for PCA, tAD, and control groups
| (A) Primary outcome: Completion time | (B) Secondary outcome: walking path straightness index (SI) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Geometric mean a in seconds (95% CI) | Percentage reduction in completion time (95% CI) | Estimated average SI (95% CI) | ||||||||
| Group | Target | Middle | Distractor | Global test b | Target vs Distractor | Middle vs Distractor | Target | Middle | Distractor | Global test c |
| PCA (N = 10‡) | 9.0 (7.5, 10.7) | 9.0 (7.5, 10.8) | 9.3 (7.8, 11.2) | P = .21 | 4.0% (−0.7, 8.4) | 3.2% (−1.5, 7.7) | 0.96 (0.95, 0.97) | 0.96 (0.95, 0.96) | 0.95 (0.94, 0.96) | P = .20 |
| tAD (N = 9) | 6.5 (5.7, 7.4) | 6.6 (5.8, 7.5) | 6.7 (5.9, 7.7) | P = .61 | 3.2% (−3.5, 9.4) | 2.5% (−4.3, 8.8) | 0.97 (0.96, 0.98) | 0.97 (0.96, 0.98) | 0.97 (0.96, 0.98) | P = .81 |
| Controls (N = 12) | 5.4 (5.0, 5.7) | 5.3 (5.0, 5.7) | 5.3 (5.0, 5.7) | P = .75 | −0.4% (‐2.1, 1.3) | 0.2% (‐1.5, 1.9) | 0.97 (0.97, 0.98) | 0.97 (0.97, 0.98) | 0.97 (0.97, 0.98) | P = .93 |
Abbreviations: PCA, posterior cortical atrophy; SI, straightness index; 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 localized lighting conditions.
c
Walking path SI data were unavailable for one PCA participant owing to recording error, so N = 9 for SI analyses.