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Aim: This study assessed the underlying structure of health-related behaviours among young adults in Iceland. A number of individual behaviours were considered, including both positive and negative health-related behaviours. A central question was whether distinct underlying health-related lifestyles can be identified in this age group. Method: The study was based on the data from a national health survey entitled ‘Health and Living Conditions in Iceland’. The original survey comprised a random sample of 18-75 year olds drawn from the National Register (response rate 69%). The current study used a subsample from the survey, consisting of young adults, age: 18-24 (N = 348). A total of 37 variables pertaining to health-related behaviour were analysed. The 37 variables were factor-analysed using principal component (PC) factor analysis. Results: The PC analysis yielded four underlying health lifestyle dimensions: (i) physical activity; (ii) unhealthy diet; (iii) substance use; and (iv) healthy diet. The four factors explained 35.3% of the total item variance. The mean Cronbach's alpha for the four factors was 0.69. Correlations between factors were generally weak. Conclusion: Distinct health-related lifestyle dimensions underlie the numerous health-related behaviours that young adults engage in. The analysis of positive and negative lifestyle dimensions helps identify vulnerable young adults disproportionally involved in unfavourable patterns of health-related behaviour. Weak factor correlations and high unexplained item variance suggests that individual health-related behaviours need consideration, albeit within a larger framework acknowledging interconnected and sometimes inconsistent behaviours. Published by arrangement with John Wiley & Sons.

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