The National Tonsil Surgery Register in Sweden (NTSRS), started in 1997 as one among several registers, aimed to reinforce quality in the Swedish health care and were revised 2009. Data in the NTSRS are collected through four questionnaires; two are filled in by the ENT-surgeon and two postoperative forms, filled in by the patient or the legal guardian, collecting patient related outcome measures (PROM) 30 respective 180 days after surgery.