Significant relationship between reading levels and endorsed librarian staffing

There is a positive and statistically significant relationship between advanced reading levels and endorsed librarian staffing trends
Schools that either maintained or gained an endorsed librarian between 2005 and 2011 tended to have more students scoring advanced in reading in 2011 and to have increased their performance more since 2005 (45% and 49%, respectively) than schools that either lost their librarians or never had one ( 33% and 29%). Conversely, schools that either lost a librarian during that period or never had one (33% and 39%) tended to have fewer students scoring advanced in 2011 and to have seen lesser gains—or indeed, losses—since 2005 than schools that maintained or gained a librarian (23% and 18%).