Data Analysis 3. Treating the outcomes as continuous, a correlation coefficient will be computed for HASS and %Forced Expiratory Volume1. Treating the outcomes as categorical, if the HASS and %Forced Expiratory Volume1 are each categorized into three levels (mild, moderate, severe), then the investigator could classify each of the nine cells of a 3 by 3 table (HASS X %Forced Expiratory Volume1) as concordant, discordant or grossly discordant (as described in Data Analysis 2). An adequate level of observed agreement would be 80% of observations in agreement cells, 18% discordant, and 2% in grossly discordant cells. In analyzing these data, both the correlation (continuous) and 3 by 3 table (categorical) treatments will be presented, with the continuous result considered primary. A high level of agreement is expected between the HASS and the spirometry severity score to make the case that the HASS can be used in place of the spirometry.