Type-specific incidence, clearance and predictors of cervical human papillomavirus infections (HPV) among young women: a prospective study in Uganda

Table 4 LSIL incidence among women with normal cytology followed upbetween March 2003 and December 2006 in Kampala, Uganda

HPV type	No. of women	Person years	Incident LSIL	Incidence rate per 100 p. yrs	Crude RR (95% CI)^a Infected/non-infected	p-value
HPV 16
Non-infected	142	114	21	18.4	1
Infected	8	9	1	11.1	0.5 (0.1 -- 3.9)	0.52
HPV 18
Non-infected	147	120	21	17.5	1
Infected	3	3	1	33.3	2.2 (0.3 -- 16.2)	0.45
High-risk HPV types
Non-infected	104	81	12	14.8	1
Infected	46	43	10	23.3	1.4 (0.6 -- 3.4)	0.39
Low-risk HPV types
Non-infected	122	99	20	20.2	1
Infected	28	24	2	8.3	0.4 (0.1 -- 1.8)	0.25
HPV 16-related ^b
Non-infected	124	98	18	18.4	1
Infected	26	25	4	16	0.8 (0.3 -- 2.3)	0.64
HPV 18-related ^c
Non-infected	142	117	19	16.2	1
Infected	8	64	3	50	3.5 (1.0 -- 11.8)	0.05
Any HPV type
Non-infected	76	58	10	17.2	1
Infected	74	65	12	18.5	1.0 (0.4 -- 2.5)	0.91

Abbreviations: CI, confidence intervals; p. yrs, person--years
^aFurther adjusted for age, HIV, lifetime number of sexual partners did not change the results
^bIncludes HPV 16, 31, 33, 35, 52 and 58
^cIncludes HPV 18, 39, 45, 59 and 68

ISSN: 1750-9378