The association between future exacerbation and neutrophil proportions levels in the air trapping group, non-air trapping group and total group
| Variables | N | Low (<86.2%) | High (≥86.2%) | OR (95% CI) | ||
| All | Air trapping | Non-air trapping | ||||
| Exacerbation≥1/year (%) | 521 | 69 (27.4) | 96 (35.7) | 1.41 (0.95 to 2.09) | 1.69 (1.01 to 2.84) | 0.97 (0.47 to 1.96) |
| Severe exacerbation (%) | 521 | 47 (18.7) | 79 (29.4) | 1.68 (1.09 to 2.62) | 1.79 (1.03 to 3.15) | 1.45 (0.65 to 3.19) |
| Exacerbation≥2/year (%) | 521 | 24 (9.5) | 39 (14.5) | 1.28 (0.67 to 251) | 1.04 (0.28 to 2.84) | 1.95 (0.47 to 8.51) |
The OR for clinical outcomes is obtained by using the logical regression model. All models are adjusted for age, sex, body mass index, smoking status, smoking index, prior exacerbation, forced expiratory volume in one second % predicted and inhaled medication.
Bold indicates p<0.05.