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Background of the study participants.
| Year | |||
|---|---|---|---|
| Characteristic | 2013 | 2014 | 2015 |
| Participants (n) | 486 | 346 | 195 |
| Male/female (n) | 217/269 | 160/186 | 81/114 |
| Age (years) mean ± SD | 62.8±18.2 | 66.5±14.6 | 68.3±14.8 |
In 2014 and 2015, the age composition of the participants was higher than expected based on the 2013 results. SD, standard deviation.
