Participant characteristics and their relationship with the fraction of exhaled NO (FeNO)
| Characteristic | No (%) of subjects | No of samples | FeNO measurements | ||
|---|---|---|---|---|---|
| Mean (ppb) | Median (ppb) | Range (ppb) | |||
| All subjects | 29 | 294 | 9.9 | 8.7 | 0.3–62.8 |
| Sex | |||||
| Male | 2 (6.9) | 22 | 9.6 | 7.9 | 1.5–23.7 |
| Female | 27 (93.1) | 272 | 9.9 | 8.7 | 0.3–62.8 |
| Age (range 53.5–90.6 years) | |||||
| ⩽70 years | 14 (48.3) | 136 | 8.3 | 7.4 | 0.3–25.4 |
| >70 years | 15 (51.7) | 158 | 11.2 | 9.5 | 3.8–62.8 |
| Race/ethnicity | |||||
| Black | 9 (31.0) | 84 | 8.8 | 8.4 | 0.3–21.5 |
| White | 20 (69.0) | 210 | 10.3 | 8.7 | 1.5–62.8 |
| COPD ever | |||||
| Yes | 7 (24.1) | 76 | 11.9 | 10.0 | 1.9–62.8 |
| No | 22 (75.9) | 218 | 9.2 | 8.2 | 0.3–32.4 |
| Asthma ever | |||||
| Yes | 8 (27.6) | 74 | 12.1 | 10.1 | 1.9–62.8 |
| No | 21 (72.4) | 220 | 9.1 | 8.1 | 0.3–32.4 |
| Cigarette smoking | |||||
| Never | 16 (55.2) | 156 | 9.8 | 8.9 | 0.3–32.4 |
| Former | 13 (44.8) | 138 | 9.9 | 8.0 | 1.5–62.8 |
| Current | 0 | – | – | – | – |
| Myocardial infarction ever | |||||
| Yes | 5 (17.2) | 57 | 10.3 | 9.2 | 4.2–24.9 |
| No | 24 (82.8) | 237 | 9.7 | 8.4 | 0.3–62.8 |