4 | 113 The transition to adulthood: A game changer!? RESULTS Number of sports and frequency of sport participation Number of sports Table 4.2 presents the effects of the major life events on the number of different sports practised by young adults, based on Poisson regression analyses, and controlled for gender, migration background, age (betweenperson difference), and aging (within-person change). For four out of five major life events we observed significant between-person differences in the number of sports, in line with our expectation. Our results indicate that respondents who left full-time education practised 40.1% fewer sports than those still in fulltime education in wave 2 (Exp(B)=0.599). Having a relationship had a negative effect as well. Respondents who were in a relationship in both waves practised 6.7% fewer sports than singles (Exp(B)=0.933), and those who were cohabiting or married practised 13% fewer sports than those who were not cohabiting or married (Exp(B)=0.870). Additionally, parents practised 15.8% fewer sports than non-parents (Exp(B)=0.842). We did not find significant between-person differences for employment. Within-person changes in the number of sports practised after a major life event all point in the expected direction, with Exp(B) consistently less than 1. This indicates that the number of sports decreased when individuals left fulltime education, began to work, entered an intimate relationship, cohabited or married, and became a parent. Occurrence of three of these events between the two waves resulted in significant changes: the number of sports practised by respondents fell by 10.9% when leaving full-time education (Exp(B)=0.891), by 11.8% when entering an intimate relationship (Exp(B)=0.882), and by 19.2% when becoming a parent (Exp(B)=0.808).