2. Inclusion
Patients undergoing surgery for an IP at our department of Otorhinolaryngology – Head and Neck Surgery were asked to participate in this study if they met the inclusion criteria.
These criteria were: 1) endoscopic endonasal surgery for a histologically proven inverted papilloma; 2) ≥18 years old; 3) capable of reading and writing in Dutch language.
After informed consent, patients received the Endonasal Endoscopic sinus and skull base Surgery Questionnaire (EES-Q) by (e-)mail and were asked to complete the questionnaire preoperatively, and then at two weeks, three months, and one year postoperatively. These questionnaire moments coincided with the regular controls in the outpatient clinic.
A preoperative EES-Q and at least one follow-up EES-Q were prerequisites for data analysis.