Problem: The NP student is completing a case study on asthma, and understands that all of the following statements are correct EXCEPT:
1) It is unproven that weather changes are a trigger for asthma
2) Spirometry (PFTs) provides an objective measure of airflow limitation
3) Symptoms of COPD include progressive dyspnea, cough, and sputum production
4) Some asthmatics demonstrate no symptoms unless they become ill with a URI