. 2020 Jun 5;22(6):e17884. doi: 10.2196/17884
©Arianna Poli, Susanne Kelfve, Leonie Klompstra, Anna Strömberg, Tiny Jaarsma, Andreas Motel-Klingebiel. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 05.06.2020.
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Figure 2.
Probability of being in one of the 3 recruitment groups (ie, nonrecruited, decliner, participant) based on age.