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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