Table 2. AVF-related infections per period.

Infectious event	Period 1	Period 2	p value δ
Local infection (alone)
Number	2	7
AVF-days	57851	97911
incidence rate (per 1000 AVF-days)	0.03	0.07	0.7
95%CI	(0.028–0.031)	(0.068–0.071)
Bacteremia (alone)
Number	0	2
AVF-days	57851	97911
incidence rate (per 1000 AVF-days)	0	0.02	0.5
95%CI	-	(0.019–0.020)
Combined local infection and bacteremia
Number	1	4
AVF-days	57851	97911
incidence rate (per 1000 AVF-days)	0.02	0.04	0.6
95%CI	(0.002–0.015)	(0.015–0.109)
All infections
Number	3	13
AVF-days	57851	97911
incidence rate (per 1000 AVF-days)	0.05	0.13	0.44
95%CI	(0.02–0.16)	(0.08–0.23)

^δ Fisher exact test