TABLE 4.

Observed means and proportions study variables, by class (n = 1419)

	Pooled sample		Class 1: Variably high problematic SMU, variably high SMU frequency		Class 2: Persistently high problematic SMU, persistently average SMU frequency		Class 3: Persistently low problematic SMU, persistently low SMU frequency		Class 4: Persistently low problematic SMU, variably high SMU frequency
	M/%	SD	M/%	SD	M/%	SD	M/%	SD	M/%	SD
Controls
Girl	45.9		58.0		35.7		30.8		51.4
Pre‐vocational education	57.8		70.0		59.8		50.3		53.3
Intermediate education	28.5		22.0		30.4		29.9		31.3
Pre‐university education	13.7		8.0		9.8		19.8		15.4
Immigrant background a	21.8		21.4		26.8		22.6		19.5
Subjective well‐being
Life satisfaction a	4.661	0.595	4.449	0.644	4.500	0.616	4.786	0.558	4.796	0.512
Self‐esteem a	3.815	0.491	3.701	0.503	3.668	0.489	3.944	0.474	3.877	0.462
Self‐control
Attention deficit a	2.285	0.526	2.555	0.507	2.383	0.490	2.081	0.501	2.188	0.485
Impulsivity a	1.918	0.484	2.204	0.513	1.989	0.447	1.676	0.388	1.843	0.428
Social competencies
Perceived friendship competence a	4.321	0.460	4.324	0.430	4.035	0.510	4.297	0.477	4.454	0.383

Abbreviations: M, mean; SD, standard deviation; SMU, social media use.

^a Proportion, means, and standard deviations for the pooled sample slightly differ from those reported in the sample description and Table 1. This is because the present table presents the proportions, means, and standard deviations based on the imputed data, whereas Table 1 presents the proportions, means and standard deviations based on the complete data.