Logistic regression analysis on the risk of progression to COPD
| Model 1 | Model 2 | |||||
| OR | 95 %Cl | P value | OR | 95% CI | P value | |
| Female* | 0.63 | 0.26 to 1.51 | 0.3 | 0.61 | 0.27 to 1.38 | 0.23 |
| Age | 0.98 | 0.95 to 1.02 | 0.28 | 0.99 | 0.95 to 1.02 | 0.47 |
| BMI | 0.88 | 0.79 to 0.98 | 0.024 | 0.88 | 0.79 to 0.98 | 0.015 |
| Ever smoker † | 1.69 | 0.76 to 3.76 | 0.19 | 2.48 | 1.16 to 5.34 | 0.019 |
| PRISm | 3.75 | 1.78 to 7.97 | <0.001 | 4.07 | 2.06 to 8.07 | <0.001 |
Model 1: PRISm defined as FEV1:FVC >70%, %FEV1 >80%.
Model 2: PRISm defined as FEV1:FVC >70%, %FEV1 >86%.
*Risk of women developing COPD for men.
†Risk of current smoker and former smoker developing COPD for never-smoker.
BMI, body mass index; COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; PRISm, preserved ratio impaired spirometry.