Both sides of the story: comparing student-level data on reading performance from administrative registers to application generated data from a reading app

EPJ Data Science

Table 1 Comparison of means; BB-users included in analytic sample vs. BB-users in total vs. country population

Variable	Active BB users	Potential users	p-value	Danish population	p-value
Income (EURO)	47,171.73	41,527.09	0.000	39,702.70	0.000
Education (years)	14.49	14.27	0.000	13.94	0.000
Occupation (ISEI)	61.21	59.55	0.000	56.39	0.000
Test-score
2nd grade	1.11	1.02	0.001	0.99	0.000
4th grade	0.98	0.90	0.003	0.85	0.000
6th grade	1.02	1.02	0.912	0.99	0.495
Single parents	0.20	0.21	0.027	0.21	0.004
Siblings	2.35	2.29	0.000	2.26	0.000
Immigrant status	0.15	0.13	0.000	0.12	0.000
Observations	13,999.00	54,991.00		436,436.00

Note: Based on data from reading app, national registers and reading ability test. ISEI: International Socio-Economic Index; 0-90 [19]. Income: Household income in EURO per year.