Table 1. Cronbach’s Alpha and DCI coefficient of brief versions and screening versions

DCI Spheres and Components	DCI Brief Version (32 items)				DCI Screening Version (16 items)
	Adolescents		Parents		Adolescents		Parents
	α	R2	Α	R2	α	R2	α	R2
DCI	0.82	94.3%	0.85	94.8%	0.71	85.4%	0.73	86.9%
Knowledge	0.69	93.6%	0.78	95.3%	0.44	71.7%	0.54	76.7%
Skills	0.72	75.3%	0.78	76.3%	0.57	66.6%	0.64	71.6%
Motication	0.38	88.9%	0.46	91.7%	0.00	61.0%	0.22	63.2%
Responsibility / safety	0.71	93.3%	0.73	94.4%	0.61	78.5%	0.62	80.1%
Content	0.44	81.1%	0.58	85.0%	0.22	58.4%	0.34	63.2%
Communication	0.59	82.9%	0.74	85.9%	0.44	61.8%	0.43	68.2%
Technosphere	0.56	86.2%	0.61	88.8%	0.36	68.2%	0.48	70.7%
Consumption	0.58	87.1%	0.57	87.4%	0.41	69.6%	0.35	64.2%

Table 2. Comparison of parents who answered correctly and incorrectly based on their digital competence of full. Short and screening versions (only components and spheres with differences in the full version)

DCI Spheres and Components	DCI Full Version		DCI Screening Version		DCI Brief Version
	Student’s t-Test	Statistical Effect η2	Student’s t-Test	Statistical Effect η2	Student’s t-Test	Statistical Effect η2
1	2	3	4	5	6	7
Competence Task for Content
Knowledge	-2.45**	0.006	-2.18*	0.005	-2.36*	0.006
Skills	-2.15*	0.005	-1.51	0.002	-2.12*	0.004
Responsibility / safety	-4.15**	0.017	-4.12**	0.017	-4.29**	0.018
DCI	-3.00**	0.009	-2.51**	0.006	-3.22**	0.010
Communication	-2.66**	0.007	-1.73	0.003	-2.16*	0.005
Technosphere	-2.94**	0.009	-1.51	0.002	-3.02**	0.009
Consumption	-3.53**	0.012	-2.89**	0.008	-3.62**	0.013
Competence Task for Communication
Knowledge	-4.09**	0.016	-4.71**	0.022	-4.38**	0.019
Skills	-5.11**	0.025	-4.53**	0.020	-4.78**	0.022
Responsibility / safety	-6.37**	0.039	-6.15**	0.036	-6.65**	0.042
DCI	-5.74**	0.032	-5.55**	0.030	-6.10**	0.036
Content	-2.98**	0.009	-2.50**	0.006	-2.72**	0.007
Communication	-6.33**	0.038	-4.61**	0.021	-6.45**	0.040
Technosphere	-4.91**	0.023	-4.31**	0.018	-4.96**	0.024
Consumption	-5.78**	0.032	-4.94**	0.024	-5.93**	0.034
Competence Task for Technosphere
Skills	-2.70**	0.007	-1.94*	0.004	-2.46**	0.006
Motivation	2.99**	0.009	3.23**	0.010	2.71**	0.007
Responsibility / safety	-3.19**	0.010	-4.29**	0.018	-3.29**	0.011
DCI	-2.05*	0.004	-2.75**	0.007	-2.18*	0.005
Communication	-3.33**	0.011	-2.93**	0.008	-2.45**	0.006
Competence Task for Consumption
Knowledge	-4.02**	0.016	-4.24**	0.018	-3.60**	0.013
Skills	-3.95**	0.015	-3.52**	0.012	-3.72**	0.014
Responsibility / safety	-5.29**	0.027	-4.58**	0.020	-5.36**	0.028
DCI	-5.07**	0.025	-5.22**	0.026	-4.96**	0.024
Content	-3.92**	0.015	-3.11**	0.009	-3.70**	0.013
Communication	-4.31**	0.018	-4.88**	0.023	-4.42**	0.019
Technosphere	-4.32**	0.018	-2.71	0.007	-4.04**	0.016
Consumption	-4.49**	0.020	-4.83**	0.023	-4.31**	0.018

Table. 3. Comparison of adolescents who answered correctly and incorrectly based on their digital competence of short and screening versions (only components and spheres with differences in the full version)

DCI Spheres and Components	DCI Full Version		DCI Screening Version		DCI Brief Version
	Student’s t-Test	Statistical Effect η2	Student’s t-Test	Statistical Effect η2	Student’s t-Test	Statistical Effect η2
Competence Task for Content
Knowledge	-2.12*	0.004	-1.34	0.001	-1.93*	0.003
Responsibility / safety	-3.91**	0.013	-3.42**	0.010	-3.83**	0.012
DCI	-2.52*	0.005	-2.16*	0.004	-2.43*	0.005
Content	-2.22*	0.005	-1.40	0.002	-1.11	0.001
Communication	-2.26*	0.004	-2.16*	0.004	-2.71*	0.006
Competence Task for Technosphere
Skills	-3.20**	0.009	-1.43	0.002	-0.62	0.000
Responsibility / safety	-4.05**	0.013	-4.33**	0.015	-3.90**	0.013
DCI	-2.62*	0.006	-2.79*	0.006	-1.84	0.003
Communication	-3.96**	0.013	-3.04**	0.008	-2.76*	0.006
Technosphere	-2.17*	0.004	-2.22*	0.004	-1.28	0.001
Consumption	-2.70*	0.006	-3.63**	0.011	-2.85**	0.007
Competence Task for Consumption
Knowledge	-3.29**	0.009	-2.22*	0.004	-3.25**	0.009
Skills	-4.34**	0.015	-4.26**	0.039	-3.75**	0.012
Responsibility / safety	-6.14**	0.076	-4.66**	0.018	-5.84**	0.028
DCI	-5.24**	0.022	-4.74**	0.018	-5.28**	0.023
Content	-4.91**	0.020	-2.78*	0.006	-4.14**	0.036
Communication	-4.45**	0.016	-3.89**	0.012	-4.62**	0.017
Technosphere	-4.64**	0.018	-4.01**	0.013	-4.42**	0.016
Consumption	-3.77**	0.028	-3.10**	0.008	-3.94**	0.032

* – p<0,05, ** – p<0,01.

Table 4. Cronbach’s Alpha index of and DCI coefficient in children and parents

DCI Components	Screening Version (children. N=50)	Screening Version (parents. N=100)	Brief Version (parents. N=100)
DCI	0.59	0.76	0.85
Components of knowledge. skills and responsibility / safety	0.65	0.80	0.89
Components of skills and responsibility / safety	0.71	0.79	0.86
Knowledge	–	–	0.81
Skills	–	–	0.73
Motivation	–	–	0.41
Responsibility / safety	–	–	0.80

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