Table 2 Description of cleaned variables
Variable Name | mean | std | min | 25% | 50% | 75% | max |
|---|---|---|---|---|---|---|---|
Reading app data | |||||||
Reading speed | 152.36 | 63.67 | 25.00 | 107.50 | 141.00 | 184.00 | 516.00 |
Session length (seconds) | 64.73 | 43.76 | 7.00 | 31.55 | 53.00 | 87.00 | 274.00 |
Page turns per session | 10.24 | 7.13 | 5 | 6 | 8 | 12 | 156 |
Sessions per student | 19.77 | 36.03 | 1 | 3 | 8 | 21 | 559 |
lix | 24.68 | 4.99 | 3 | 22 | 25 | 27 | 56 |
Genre of book | |||||||
Fiction | 0.91 | 0.29 | 0 | 1 | 1 | 1 | 1 |
Non-fiction | 0.01 | 0.09 | 0 | 0 | 0 | 0 | 1 |
Text book | 0.03 | 0.16 | 0 | 0 | 0 | 0 | 1 |
Unlabeled | 0.07 | 0.25 | 0 | 0 | 0 | 0 | 1 |
Weekend reading (vs. non-weekend) | 0.12 | 0.33 | 0 | 0 | 0 | 0 | 1 |
Schools hours 7 am to 3 pm (vs. non-school hours) | 0.47 | 0.59 | 0 | 0 | 0 | 1 | 1 |
Reading ability test data | |||||||
Reading ability test score | 2.46 | 18.04 | −58.0 | −7.00 | 2.00 | 11.5 | 63.5 |
Grade level | 4.85 | 1.41 | 1 | 4 | 5 | 6 | 9 |
Register data | |||||||
Sex (boy = 1, girl = 2) | 1.54 | 0.50 | 1 | 1 | 2 | 2 | 2 |
Age | 11.37 | 1.51 | 7 | 10 | 11 | 12 | 16 |
Immigrant status | |||||||
Both student and parents born in country | 0.89 | 0.31 | 0 | 1 | 1 | 1 | 1 |
Born in country, but parents born abroad | 0.03 | 0.17 | 0 | 0 | 0 | 0 | 1 |
Born abroad like the parents | 0.08 | 0.28 | 0 | 0 | 0 | 0 | 1 |
Number of siblings | 2.32 | 0.91 | 0 | 2 | 2 | 3 | 8 |
Single parent | 0.18 | 0.39 | 0 | 0 | 0 | 0 | 1 |
Log income, mother | 12.57 | 0.54 | 7.41 | 12.34 | 12.60 | 12.86 | 16.40 |
Log income, father | 12.79 | 0.69 | 3.64 | 12.47 | 12.78 | 13.10 | 19.36 |
Years of education, mother | 14.24 | 2.72 | 6.00 | 12.00 | 15.00 | 17.00 | 20.00 |
Years of education, father | 14.00 | 2.82 | 6.00 | 12.00 | 14.00 | 17.00 | 20.00 |
Occupational status, mother | 59.90 | 20.34 | 11.56 | 44.72 | 67.11 | 76.24 | 88.96 |
Occupational status, father | 57.64 | 22.18 | 11.56 | 35.34 | 65.01 | 75.50 | 88.70 |