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Table 2 “Books at home” across survey cycles.

From: The measure of socio-economic status in PISA: a review and some suggested improvements

 PISA 2000PISA 2003PISA 2006PISA 2009PISA 2012PISA 2015PISA 2018
How many books are there in your home?ST37Q01ST19Q01ST15Q01ST22Q01ST28Q01ST013Q01TAST013 Q01TA
None1      
1–10 books2      
11–50 books3      
51–100 books4      
101–250 books5      
251–500 books6      
More than 500 books7666666
0–10 books 111111
11–25 books 222222
26–100 books 333333
101–200 books 444444
201–500 books 555555
  1. When scaling HOMEPOS, in PISA 2003, only two categories (up to 100, 101 and more) were used; in PISA 2006, only three categories (“0–25 books”, “26–100 books”, “More than 100 books”) were used; in PISA 2009, only four categories (“0–25 books”, “26–100 books”, “100–500”, “More than 500 books”) were used. In PISA 2012 and 2015, all categories were used; however, for the purpose of trend scaling, in PISA 2015 only four categories (“0–10 books”, “11–100 books”, “100–500”, “More than 500 books”) were used