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Table 2 Description of cleaned variables

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

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
  1. Note: Statistics based on reading data from August 2019 to February 2020, reading ability data and register data.