Maartje Boer

CHAPTER 2 46 SMU class, almost all adolescents (95.11%) endorsed two to f ive criteria. In the normative problematic SMU class, almost all adolescents (97.86%) endorsed not more than one criterion. These results suggest that subgroups may be distinguished by the number of endorsed criteria rather than by the presence of a particular set of criteria or criterion. Figure 2.4 Distribution of Latent Classes, by the Number of Endorsed Criteria, n = 6,626 Note. SMU = social media use. Criterion Validity Table 2.4 reports the associations between problematic SMU and mental, school, and sleep problems. The higher the number of endorsed criteria, the higher the probability of reporting problems related to mental health, school, and sleep (OR range = 1.18 (low sleep duration) to 1.40 (conduct problems), p < 0.001). In separate models, we additionally examined the extent to which subgroups of users reporteddifferences inmental, school, and sleepproblems.