Table 5.

Association between age and catheter infection rate by organism

	Rate ratio (per decade increase in age)	95% CI	P
Gram positive	0.93	0.88 to 0.98	0.008
Gram negative	1.01	0.90 to 1.14	0.85
Culture negative	1.01	0.79 to 1.28	0.96
CNS	1.01	0.90 to 1.15	0.83
S. aureus	0.89	0.82 to 0.96	0.003
Streptococcus	1.01	0.96 to 1.07	0.67
Pseudomonas	1.02	0.88 to 1.47	0.82
E. coli	1.00	0.95 to 1.07	0.90
Yeast	1.02	0.97 to 1.08	0.43

CNS, coagulase negative staphylococcus; CI, confidence interval.