Measurement of ambient NO |
Daily or before each test | 41 (63) | 50–75 |
Not systematically | 6 (9) | 3–19 |
Never | 18 (28) | 17–40 |
Number of nostrils sampled during one test |
Always in both nostrils | 41 (63) | 50–75 |
Not systematically in both nostrils | 15 (23) | 13–35 |
Never in both nostrils | 9 (14) | 6–25 |
Number of measurements per nostril |
One | 14 (22) | 12–33 |
Two | 32 (49) | 37–62 |
More than two | 19 (29) | 19–42 |
Methods used in centres to sample nasal NO# |
Exhalation against a resistor | 49 (75) | 63–85 |
Tidal breathing | 50 (77) | 65–86 |
Breath-hold | 10 (15) | 8–26 |
Humming | 2 (3) | 0–11 |
Between-measurement repeatability within individuals |
Not reported | 17 (26) | 16–39 |
Reported, expressed as ppb | 3 (5) | 10–13 |
Reported, expressed as % | 35 (54) | 41–66 |
Reported, expressed as ppb and % | 10 (15) | 8–26 |
Report of nasal NO results includes |
Practical issues during measurements¶ | 55 (85) | 74–92 |
Sampling flow of the device | 31 (48) | 35–60 |
Ambient NO | 27 (42) | 29–54 |
Nasal NO results in nL·min−1 | 16 (25) | 15–37 |
Nasal NO results in ppb | 33 (50) | 38–63 |
Nasal NO results in nL·min−1 and ppb | 16 (25) | 15–37 |