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Effect of the usability on satisfaction at different levels of the GDSa.
| Effect | Estimate | Standard error | Z | P value |
| Average | 0.43 | 0.083 | 5.22 | <.001 |
| Low (–1 SD) | 0.56 | 0.135 | 4.16 | <.001 |
| High (+1 SD) | 0.30 | 0.070 | 4.36 | <.001 |
aGDS: Geriatric Depression Scale.
