Table 1 The schedule of enrolment, interventions, and assessments. T1 = within 2 weeks of allocation, T2 = 2 weeks after endoscopic sinus surgery, T3 = 3 months follow-up, T4 = 5–7 months. The study logbook is filled at home continuously between allocation and the end of follow-up. ESS, endoscopic sinus surgery; SNOT-22, Sinonasal Outcome Test 22; RAND-36, Research and Development 36-item Health Survey
