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Respondents’ answers to survey question: “Over the six month Gray Matters intervention period (April 2014 – October 2014), how often did you use the App?”
| Usage | N | Mean | Standard deviation |
| Months used | 39 | 5.54 | 1.315 |
| Days per week | 38 | 6.21 | 1.695 |
| Times per day | 38 | 1.66 | 3.122 |
