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

Table 6 Risk analysis for the persistence of HPV 16 with other HPV types and only HPV16

Volume	HPV 16+ other HPV types	HPV 16	Total	p-value Risk analysis
6 Months
> = 36.5	7	15	22	p = 0.77
<36.5	3	5	8	RR = 0.85 95 %ϵ(0.28; 2.51)
Total	10	20	30	RR = 0.85 95 %ϵ(0.28; 2.51)
12 Months
> = 36.5	0	10	10	p = 0.019
<36.5	2	2	4	RR = 0 undefined
Total	2	12	14	RR = 0 undefined
18 Months
> = 36.5	0	8	8	p = 0.102
<36.5	1	2	3	RR = 0 undefined
Total	1	10	11	RR = 0 undefined

Risk analysis for the persistence of HPV 16 with other HPV types and only HPV16 (the contingence tables, the p values, the relative risk values and the risk inference intervals for 95 % of the population). We considered as an exposure the age above 36.5 years

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