“…Two steps were needed before assessing psychometrics properties of the ABPA. First, we needed to test the hypothesis that awake breathing is best described by three groups (NB, OB and MB), as suggested by the consensus of experts who participated in developing the clinical grid ( 11 ) . Second, as the continuous variable of CO 2 percentage was selected as the reference measurement for the psychometric assessment of the ABPA, we needed to discretize it into categories in order to make it suitable for the categorical nature of the grid’s data.…”