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

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

	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^***

One-way repeated measures ANOVA analyses; Pearson’s correlation analyses; SPA Smart phone addiction, DS Depressive symptoms; ^***p < .001

ISSN: 1471-244X