The latter group involved patients with Down syndrome (n = 552), congenital airway anomalies (n = 397), pulmonary disorders (n = 358), cystic fibrosis (n = 255), neuromuscular impairments (n = 150), multiple system chromosomal or dysmorphological syndromes (n = 146), immunological compromise (n = 61), serious cardiac conditions beyond 2 years of age (n = 46) and other miscellaneous indications (n = 416).
Source: wiktionary