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

Table 4 Risk analysis for the persistence of HPV 16

Volume N = 110	HPV 16+	HPV 16-	Total	p-value Risk analysis
6 Months
> = 36.5	22	33	55	p = 0.0027
<36.5	8	47	55	RR = 2.75 95 %ϵ(1.34; 5.64)
Total	30	80	110	RR = 2.75 95 %ϵ(1.34; 5.64)
12 Months
> = 36.5	10	45	55	p = 0.0861
<36.5	4	51	55	RR = 2.5 95 %ϵ(0.83; 7.49)
Total	14	96	110	RR = 2.5 95 %ϵ(0.83; 7.49)
18 Months
> = 36.5	8	47	55	p = 0.1120
<36.5	3	52	55	RR = 2.67 95 %ϵ(0.75; 9.53)
Total	11	99	110	RR = 2.67 95 %ϵ(0.75; 9.53)

Risk analysis for the persistence of HPV 16 (the contingence tables, the p values, the relative risk values and the risk inference intervals for 95 % of the population). With HPV16+ we marked the patients having HPV16, and with HPV16- the patients without this HPV type. We considered as an exposure the age above 36.5 years

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