Concern has long existed that persistent otitis media in young children, because of the associated conductive hearing loss, can result in lasting impairments of the children’s development. Accordingly, myringotomy with insertion of tympanostomy tubes has often been undertaken in such children in order to promptly restore hearing to normal. However, evidence concerning developmental effects of persistent early-life otitis media has been inconclusive, and evidence that tube insertion in affected children influences their development favorably has been lacking. From a previous study we reported that among a cohort of children younger than three years of age with persistent effusion, prompt as compared with delayed insertion of tympanostomy tubes did not result in improved developmental outcomes in the children at three, four, and six years of age. The purpose of the present study was to assess developmental outcomes in the same children at nine to eleven years of age.