CAS1.x, 2.x, and 3.x, and tree cluster 1.x, 2.x and 3.x, refer to the intersection of npEM-generated clusters and age-5 wheeze status, and their analogous decision tree cluster, respectively. The second digit (x.0 or x.1) refers to age-5 wheeze status, with ‘1’=present wheeze and ‘0’=no wheeze. Boxes, bars and digits with red outline indicate those with predicted (tree cluster) or actual (CAS npEM cluster) age-5 wheeze. Note that the tree did not predict for non-wheezing CAS3, so there is no tree cluster 3.0, and all CAS3 individuals were automatically assigned to a wheezing tree cluster.