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ObservationtimeDrop-outrateOutcomeStudy qualityCommentsFollow-up2 weeks, 4months postoperativelythen every 2months untilextrusion25%Due to irregularfollow-upMean retention time:Anterio-superior:12 months (SD 6.6)Anterio-inferior:12.8 months (SD 6.4)p=0.1306nsLowNot randomisedbetween differenttube typesAfter 6 weeks,then every6 months upto 29 months(mean 17months)10% Perforation rate:Anterior: 1.8%Posterior: 3.7%nsMediumQuadrants notdescribed3 months 13% Proportion functioning tubes:Eardrops: 92.8%Untreated: 89.7%nsMediumBlocked grommets:Eardrops: 3.9%Untreated: 7.1%1 week,3 weeks,3 monthsExcluded: patientswho did not comefor follow-up or whodeveloped post-operativeotorrheaObstruction:Otrivin: 0Control: 10.5% (8 ears)LowThe table continues on the next pagekapitel 3 • Resultat av litteraturgranskningen 143

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