Maartje Boer

SMU AND ADHD-SYMPTOMS 143 5 Table 5.4 RI-CLPM, Between-Person Correlations (n = 543) SMU intensity SMU problems Attention deficits Impulsivity r SE p r SE p r SE p r SE p SMU intensity 1.00 SMU problems 0.40 0.08 < 0.001 1.00 Attention deficit 0.23 0.06 < 0.001 0.24 0.11 0.032 1.00 Impulsivity 0.23 0.06 < 0.001 0.23 0.11 0.031 0.67 0.05 < 0.001 1.00 Hyperactivity 0.29 0.06 < 0.001 0.29 0.10 0.003 0.63 0.07 < 0.001 0.64 0.05 < 0.001 Notes. SMU = social media use; RI-CLPM = random intercept cross-lagged panel model; r = correlation; SE = standard error; p = p-value. Table 5.5 RI-CLPM, Standardized Within-Person (Cross-)Lagged Effects (n = 543) (T2 →) SMU intensity SMU problems Attention deficits Impulsivity Hyperactivity β SE p β SE p β SE p β SE p β SE p (T1 ↓) SMU intensity 0.10 0.15 0.506 0.02 0.05 0.758 0.05 0.08 0.508 0.03 0.10 0.739 0.10 0.08 0.221 SMU problems 0.31 0.21 0.140 0.79 0.04 < 0.001 0.31 0.11 0.004 0.19 0.13 0.150 0.07 0.09 0.409 Attention deficit -0.03 0.18 0.857 -0.04 0.05 0.421 0.42 0.12 0.001 0.05 0.13 0.721 -0.08 0.09 0.391 Impulsivity -0.06 0.18 0.735 0.13 0.08 0.090 -0.08 0.17 0.623 0.07 0.17 0.671 0.03 0.14 0.857 Hyperactivity 0.14 0.16 0.380 -0.04 0.04 0.413 -0.06 0.12 0.611 0.19 0.11 0.094 0.53 0.10 < 0.001 (T3 →) SMU intensity SMU problems Attention deficits Impulsivity Hyperactivity β SE p β SE p β SE p β SE p β SE p (T2 ↓) SMU intensity 0.29 0.29 0.311 -0.05 0.06 0.447 -0.13 0.20 0.511 -0.08 0.16 0.602 -0.04 0.19 0.831 SMU problems 0.33 0.24 0.163 0.99 0.04 < 0.001 0.50 0.21 0.016 0.51 0.14 < 0.001 0.28 0.20 0.158 Attention deficit -0.26 0.22 0.248 -0.01 0.05 0.910 0.19 0.24 0.431 -0.19 0.18 0.281 -0.26 0.22 0.241 Impulsivity 0.13 0.17 0.450 -0.05 0.04 0.294 0.19 0.15 0.191 0.38 0.14 0.008 0.14 0.16 0.382 Hyperactivity 0.08 0.20 0.678 0.00 0.05 0.999 -0.26 0.16 0.112 0.04 0.13 0.763 0.34 0.18 0.054 Notes. SMU = social media use; RI-CLPM = random intercept cross-lagged panel model; β = standardized coefficient; SE = standard error; p = p-value. Light gray cells depict results for Hypotheses 1 and 2; Dark gray cells depict results for Hypotheses 3 and 4.