Table 3. Comparison of nasal Staphylococcus aureus and methicillin-resistant S. aureus (MRSA) colonization rate between subjects using catheters/tubes or not.

Carrier	No.(%) of subjects			Odds Ratio[95% confidence interval]	p value
	subjects using catheters or tubes	subjects not using catheters or tubes	Total
Subject No.	66	436	502
MRSA	7(10.6)	12(2.8)	19(3.8)	4.192(1.587–11.071)	0.002
S. aureus	21(31.8)	66(15.1)	87(17.3)	2.616(1.464–4.674)	0.001