Table 2.

Incidence and attributable risk of infection

	Number of infections		Incidence rate (infections/1,000 resident-months)		Relative risk (95%)	p-value	Attributable rate	Attributable fraction (AR%)
	Device (263 f/u-mon)	Non-device (644 f/u-mon)	Device (IRe)	No-device (IRu)			(IRe – IRu)	([IRe – IRu]/IRe) × 100
Total infectionsa	87	110	331	171	1.9 (1.4–2.6)	<0.001	160	48
Urinary tract infectionsa	49	54	186	84	2.2 (1.5–3.3)	<0.001	102	55
Pneumoniaa	23	20	87	31	2.8 (1.5–5.4)	0.0004	56	64
Other infectionsb	15	36	57	56	1.0 (0.5–1.9)	0.47	5.7	2
McGeer–s criteriac	8	15	30	23	1.3 (0.5–3.3)	0.27	7.1	23
Minimum criteriac	12	10	46	16	2.9 (1.2–7.6)	0.007	30	66
McGeer’s or minimum criteriac	15	18	57	28	2.0 (1.0–4.3)	0.02	29	51

^aClinical defintion

^bIncludes skin and soft tissue infections, Clostridium difficile colitis, conjunctivitis, upper respiratory, and lower respiratory tract infections

^cIncludes pneumonia and/or urinary tract infections