FIGURE 5.

Respiratory infections by feeding groups in the subgroup of cystic fibrosis infants with pancreatic insufficiency but not meconium ileus. A: Number of Pseudomonas aeruginosa infections through 2 y of age. B: Number of Staphylococcus aureus infections. P values indicate significance as assessed by Fisher's exact test. ExBF, exclusive breastfeeding; ExBF=1mo, ExBF for 1–1.9 mo; ExFM20, exclusively fed a formula that contained a standard caloric density of 0.67 kcal/mL (equivalent to 20 kcal/oz); ExFM22+, exclusively formula-fed and received a formula with a high caloric density [≥0.74 kcal/mL (≥22 kcal/oz)] for some duration during infancy.