4 | 107 The transition to adulthood: A game changer!? METHODS Data and methods To answer our research question, we employed data from the 2009 and 2013 waves of the Netherlands Longitudinal Lifecourse Study (Tolsma et al., 2014). This is a nationally representative large-scale panel survey of 15–45 year olds in the Netherlands. A two-stage stratified sampling technique was applied. In the first stage, a quasi-random selection was made of 35 municipalities by region and urbanisation. In the second stage, a random selection was performed from the selected municipalities’ population registries. The fieldwork of the first wave has been done by Intomart GfK. The questionnaire of the first wave consisted of two parts: a face-to-face fully structured interview and a selfcompletion questionnaire. The fieldwork of the second wave has been done by Veldkamp in a mixed mode: all questions were either administered face-toface or via a computer assisted web interview (CAWI). To facilitate the study of social dynamics from a life-course perspective, data was collected on a range of topics, including respondents’ life transitions and leisure activities. This makes NELLS especially suited for our investigation of changes in sport participation and the influences of life events that mark the transition to adulthood. For a full description of sampling, the design and fieldwork and coding, see Tolsma et al. (2014). For our study, we employed information on 2829 respondents who participated in both waves (response rate wave 1: 52%; wave 2: 75%). We further selected respondents without missing information on the relevant measures. We excluded 463 respondents who had experienced reversed transitions following the transition to adulthood, such as ending a relationship and quitting a job. By doing so, we avoided ambiguities in the interpretation of the effects of major life events as markers of the transition to adulthood, in line with our theoretical framework. For our examination of dropping out of club-organised sport, we further restricted the sample to individuals who practised sport (mostly) in a club setting in wave 1 (2009). This produced a sample of 2317 individuals for our analyses of the number of sports and frequency of participation, and a more restricted sample of 522 individuals for our analysis of the switch from a club setting to a “lighter” setting or not practising sport at all.
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