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Table 2 Levels of smart phone addiction and depressive symptoms at T1, T2, T3 and T4

From: A longitudinal study of changes in smart phone addiction and depressive symptoms and potential risk factors among Chinese college students

  T1 T2 T3 T4 Group comparison
SPA      F = 8.29*** (T1 > T2, T3, T4)
 Mean 48.22 44.65 45.99 45.72  
 SD 10.60 11.31 12.71 11.63  
DS      F = 22.49*** (T1, T2, T3 < T4)
 Mean 14.61 15.31 15.93 19.08  
 SD 8.35 9.30 9.97 6.63  
r between SPA and DS .39*** .45*** .51*** .44***  
  1. One-way repeated measures ANOVA analyses; Pearson’s correlation analyses; SPA Smart phone addiction, DS Depressive symptoms; ***p < .001