There was also a numerical trend evident for the three groups independently (Table 2 ) with 5.13% versus 2.38% for severe CRS (relative risk 1.679; 95% CI 0.947–2.583), 5.77% versus 4.28% for severe CRS and NT (relative risk 1.247; 95% CI 0.6874–2.004), and 9.62% versus 5.94% for severe NT (relative risk 1.428; 95% CI 0.9038–2.085) although not reaching statistical significance.
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