Fig. 1From: Twelve-year follow-up study after endoscopic sinus surgery in patients with chronic rhinosinusitis with nasal polyposisSymptoms, expressed as no, mild, moderate or severe are shown as the percentage of study population that experience complaints with the respective severity, at each time point (2000 N = 47, 2006 N = 27 and 2012 N = 24). The percentages are marked in the bars. **P < 0.01; ***P < 0.001Back to article page