After successful completion of the run-in period, participants will have 3 in-person visits, at which office spirometry will be performed and weight and height measured. Participants will perform home spirometry weekly during the study period. They will also electronically complete a weekly electronic patient reported outcome (ePRO) Within one week of each in-person visit, they will measure height and weight at home and perform home spirometry with virtual coaching by site research staff. They will complete a brief ePRO every 4 weeks regarding acceptability and feasibility of home spirometry in research. Within two weeks after study completion, a purposive subsample will complete an exit interview.
This is a prospective, longitudinal multicenter observational study comparing home to office spirometry and home to office weight and height measurements. The aim of the study is to estimate the accuracy and variability of home spirometric measurements over time, and to assess the feasibility and acceptability of home measurements.