Table 1

Children classified in the Dunedin sample according to severity of otological features from age 5 up to age 9

Classification Number % Description
1535.5Bilateral tubes on ⩾ 1 occasion, for OME with proven hearing loss
2454.7Bilateral persistent OME with or without VT but no evidence of HL exceeding 25 dB on at least one occasion
3262.7Unilateral persistent OME with or without VT on at least one occasion
411812.3Transient unilateral or bilateral OME on at least one occasion
513814.3No evidence of OME but scar tissue present
644946.7C tympanogram on at least one occasion but no OME or type B tympanogram
713313.8Always type A tympanogram in both ears
Total 962 100
  • HL, hearing loss; OME, otitis media with effusion; VT, ventilation tube.