Compared with those that drop out, participants that remain in a longitudinal study are generally:

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Participants that remain in a longitudinal study are generally more likely to be all of the above. They tend to be more educated, as they may be more interested and willing to commit to the demands of long-term research studies. They may also be healthier, as illness or disability could interfere with participation. Finally, they are more motivated, either due to a personal interest in the research topic or a desire to contribute to scientific knowledge.

Compared with Those That Drop Out, Participants That Remain in a Longitudinal