Table 3.

Hierarchical regression results with Mental health problems at T2 as outcome.

	Model 1				Model 2				Model 3				Model 4
	B	(SE)	Beta	P-value	B	(SE)	Beta	P-value	B	SE	Beta	P-value	B	(SE)	Beta	P-value
(Constant)	1.505	0.120		0.000	0.866	0.128		< 0.001	0.806	0.127		< 0.001	0.865	0.122		< 0.001
Gender (1 = female)	0.359	0.052	0.263	< 0.001	0.246	0.050	0.180	< 0.001	0.264	0.050	0.193	< 0.001	0.226	0.047	0.163	< 0.001
Life events at T2 (n = 1)	0.262	0.064	0.168	< 0.001	0.199	0.060	0.127	< 0.001	0.216	0.059	0.138	< 0.001	0.226	0.056	0.145	< 0.001
Life events at T2 (n ≥ 2)	0.453	0.063	0.304	< 0.001	0.337	0.059	0.226	< 0.001	0.343	0.059	0.230	< 0.001	0.309	0.056	0.204	< 0.001
Subjective SES at T2 (1 = not wealthy)	0.018	0.054	0.013	0.738	0.016	0.050	0.011	0.751	0.016	0.050	0.011	0.748	−0.018	0.047	−0.013	0.694
At-home living situation at T2 (1 = with 3 or more other people)	0.092	0.056	0.064	0.097	0.102	0.051	0.071	0.046	0.099	0.051	0.069	0.051	0.069	0.049	0.046	0.163
Use of screens for home schooling at T2	0.111	0.035	0.119	0.002	0.105	0.033	0.113	0.001	0.095	0.033	0.102	0.004	0.094	0.031	0.100	0.003
Overall mental health problems at T1					0.372	0.037	0.371	< 0.001	0.390	0.037	0.389	< 0.001	0.401	0.036	0.394	< 0.001
Internet useΔT2−T1									−0.006	0.016	−0.017	0.715	–	–	–	–
Smartphone useΔT2−T1									0.007	0.018	0.019	0.699	–	–	–	–
MessagingΔT2−T1									0.015	0.016	0.041	0.364	–	–	–	–
Video gamingΔT2−T1									−0.020	0.015	−0.050	0.171	–	–	–	–
Social media useΔT2−T1									0.041	0.017	0.112	0.016	–	–	–	–
Television viewingΔT2−T1									−0.023	0.012	−0.069	0.053	–	–	–	–
Overall social screen timeΔT2−T1													0.036	0.015	0.083	0.014
R 2	0.188**				0.311**				0.326**				0.301**

^**p < 0.01. _ΔT2−T1 = difference index between T2 and T1 (SE) = standard error.