Demographic data distinguished by occupationb'*'.

The present study analyses the technical requirements as well as the user behaviour of seafarers for an app-based health prevention, including apps for wellness, prevention, fitness, medical care and mental well-being. In a maritime field study 976 seafarers on 65 merchant ships participated in the survey carried out with a questionnaire. The vast majority (98.4%) of the respondents had a mobile device on board. 52.5% stated to already have downloaded a health app, with a higher proportion among the officers (adjusted Odds Ratio (aOR) 1.67; 95% CI (1.13–2.50)). The most common reasons for downloading this kind of app were activity tracking (74.8%), weight loss (41.8%) and exercise (41.0%). Officers downloaded apps significantly more often for activity tracking (p