Fig. 4

Absolute side difference [abs(right-left); mean ± 95 CI] of the nasal cross-sectional areas, CT-CSA of the total nose (both sides; mean ± 95 CI) and size of CT-CSA on the narrow side of the nose (mean ± 95 CI). In the anterior nose (ant-30, ant-60 and ant-90), note larger side differences in cases than in controls, indicating a greater nasal asymmetry in cases. Side differences in the posterior nose (post-50, post-80 and post-100) were similar between cases and controls. Also, note narrower total nasal airway width of the anterior nose in cases than in controls, but similar width of the total nasal airway between cases and controls in the posterior nose. Lastly, note smaller CT-CSA on the narrow side of the anterior nose in cases than in controls (all p < 0.001), but similar size of CT-CSA on the narrow side in the posterior nose between cases and controls. X-Axis: planes; Y-Axis: mean size of CT-CSA in mm²