These are typically reported as year-and-month scores; thus a book scoring at reading level 8.1 is said to be written at the early eighth-grade level, while a student scoring at reading level 4.6 ...

For the 1st grade fiction list, for instance, it says that the average ATOS book level was 1.3 overall, meaning that those top 20 books, on average, were suitable for a child in the third month of ...