Table 2 Results for nasal lavage fluid sampling. Data are expressed as mean ± standard deviation or median [interquartile range]. NLF: nasal lavage fluid, NELF: nasal epithelial lining fluid

Recovered volume [%]

73.1 ± 11.5

73.8 ± 13.0

72.0 ± 9.6

Plasma urea [mg/dL]

12.3 ± 3.5

13.8 ± 3.3

10.1 ± 2.6

NLF urea [mg/dL]

1.0 ± 0.6

1.1 ± 0.4

0.9 ± 0.7

Dilution factor

12.3 [10.0–19.0]

12.0 [10.4–16.9]

17.0 [10.0–21.6]

Volume NELF sampled [µL]

883.6 [555.6–1,112.0]

910.4 [628.5–1,061.7]

623.5 [484.8–1,112.0]