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<h2>Inclusion criteria</h2> <p>The original data sample was generated by sampling users with the following characteristics:</p> <ul> <li>Sign-up between Aug 1, 2013 and December 31st, 2016</li> <li>Age at signup between 18 and 90</li> <li>From the US, Canada, or Australia</li> <li>English is preferred language</li> <li>At least 500 lifetime gameplays</li> <li>At least 99% of their lifetime Lumosity gameplays were on the web product (as opposed to mobile apps)</li> <li>To exclude users who choose to repeat specific games rather than play from the broader game library, we only included users if 5% or fewer of their gameplays were repetitions of the previous game.</li> <li>Gameplay records for the set of users defined above are include from Aug 1, 2013 through June 30th, 2019.</li> </ul>
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