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ObservationtimeOutcomeStudy qualityComments3 months Perforation rate related toduration of tube retention:2–3 yearsGroup 1: 2.5%Group 2: 11.1%Low3–4 yearsGroup 1: 0%Group 2: 1.3%4–5 yearsGroup : 25%,Group 2: 50%>5 yearsGroup 1: 100%Group 2: 42%Perforation rate related to age:Group 1: 6%Group 2: 27.1%Persistent perforation afterpatching/non patchingGroup 1: 4/0Group 2: 13/3The table continues on the next pagekapitel 3 • Resultat av litteraturgranskningen 183

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