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Table 5 Correlation between reading ability test data and app generated reading speed

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

(a) By grade.
Grade Correlation # students # sessions
3rd 0.386 172 4510
5th 0.478 562 17,043
7th 0.448 17 503
(b) By grade with the outlier data.
Grade Correlation # students # sessions
3rd 0.049 915 158,749
5th 0.031 1831 198,256
7th −0.020 150 8998
(c) By grade and parental educational level (edu). Parental educational level is coded from 1 (low) to 7 (highest) in accordance with isced 1997.
Grade Edu Correlation # students # sessions
3rd 3 0.080 28 817
4 0.505 6 170
5 0.419 34 715
6 0.475 81 2291
7 0.008 23 517
5th 1 NaN <5 NaN
2 0.023 22 526
3 0.294 141 3921
4 0.491 31 1131
5 0.380 174 5546
6 0.590 155 4856
7 0.746 33 981
7th 3 0.349 6 201
4 NaN <5 NaN
5 NaN <5 NaN
6 0.386 7 227
7 NaN <5 NaN
(d) By grade and parental income. Parental income is split into below and above the median income in Denmark.
Grade Low income Correlation # students # sessions
3rd High income 0.393 132 3390
Low income 0.360 40 1120
5th High income 0.522 359 11,179
Low income 0.402 203 5864
7th High income 0.295 10 337
Low income 0.655 7 166
(e) By grade and sex.
Grade Sex Correlation # students # sessions
3rd Boys 0.330 80 2288
Girls 0.456 92 2222
5th Boys 0.596 247 6902
Girls 0.380 315 10,141
7th Boys 0.604 10 360
Girls 0.019 7 143