Table 3.

Longitudinal Culture Positivity for S. aureus and P. aeruginosa

Organism	Initial Year [n (%)]	Final through 2016 [n (%)]	OR (95% CI)*	P Value†
S. aureus	81 (60.4)	92 (68.7)	1.5 (0.87–2.57)	0.17
P. aeruginosa	78 (58.2)	99 (73.9)	4.5 (1.86–10.9)	0.0003
S. aureus and P. aeruginosa	41 (30.6)	68 (50.7)	2.6 (1.48–4.52)	0.0007

Definition of abbreviations: CI = confidence interval; OR = odds ratio; P. aeruginosa = Pseudomonas aeruginosa; S. aureus = Staphylococcus aureus.

^*Odds ratio using Mantel-Haenszel method and 95% CI.

^†P value calculated by Exact McNemar’s test, based on N = 134 individuals.