Table 3.

Follow-up data on pulmonary function, exacerbations, and hospitalizations

	Group 1: No Staphylococcus aureus; No Pseudomonas, Stenotrophomonas, or Burkholderia at Baseline (N = 437)	Group 2: Staphylococcus aureus at Baseline (N = 94)	Group 3: Pseudomonas, Stenotrophomonas, or Burkholderia and No Staphylococcus aureus at Baseline (N = 299)	P Value for χ2
No. of exacerbations between study entry and first F/U visit	N = 365	N = 81	N = 234	<0.0001*†
Mean (SD)	0.7 (1.2)	0.9 (1.0)	1.2 (1.6)
No. of hospitalizations between study entry and first F/U visit	N = 364	N = 81	N = 235	<0.0001*
Mean (SD)	0.1 (0.5)	0.2 (0.5)	0.3 (0.5)
Change in prebronchodilator FEV1 (L) from study entry to first F/U visit	N = 191	N = 41	N = 129	0.7369
Mean (SD)	0.00 (0.37)	−0.02 (0.33)	−0.05 (0.31)

Definition of abbreviation: FEV₁ = forced expiratory volume in 1 second; F/U = follow-up; SD = standard deviation.

P values are based on χ² tests for categorical variables and Kruskal–Wallis tests for continuous variables.

^*Denotes statistically significant difference between group 1 and group 3 based on post hoc Dunn’s comparison for continuous variables and using standardized residuals for categorical variables.

^†Denotes statistically significant difference between group 1 and group 2 based on post hoc Dunn’s comparison for continuous variables and using standardized residuals for categorical variables.