PISA group definitions by books in the home
| Number of books in home | ||
|---|---|---|
| 2000 | 2003 and after | |
| Group 0 | 0 | – |
| Group 1 | 1–10 | 0–10 |
| Group 2 | 11–50 | 11–25 |
| Group 3 | 51–100 | 26–100 |
| Group 4 | 101–250 | 101–200 |
| Group 5 | 251–500 | 201–500 |
| Group 6 | >500 | >500 |
Source: OECD Program for International Student Assessment (PISA) 2000, 2003, 2006, and 2009 databases