Age and HPV type as risk factors for HPV persistence after loop excision in patients with high grade cervical lesions: an observational study

Table 5 Risk analysis for the persistence of HPV coinfections

Volume N = 110	HPV+	HPV-	Total	p-value Risk analysis
6 Months
> = 36.5	32	23	55	p < 0.001
<36.5	13	42	55	RR = 2.46 95 %ϵ(1.45; 4.16)
Total	45	65	110	RR = 2.46 95 %ϵ(1.45; 4.16)
12 Months
> = 36.5	16	39	55	p = 0.0171
<36.5	6	49	55	RR = 2.67 95 %ϵ(1.13; 6.30)
Total	22	88	110	RR = 2.67 95 %ϵ(1.13; 6.30)
18 Months
> = 36.5	8	47	55	p = 0.3755
<36.5	5	50	55	RR = 1.60 95 %ϵ(0.55; 4.58)
Total	13	97	110	RR = 1.60 95 %ϵ(0.55; 4.58)

Risk analysis for the persistence of HPV coinfections (the contingence tables, the p values, the relative risk values and the risk inference intervals for 95 % of the population). We marked with co-infections (HPV+) the patients who have at least two different HPV types and with HPV- patients who have just one HPV type. We considered as an exposure the age above 36.5 years

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