Abstract
BackgroundAnogenital warts (AGW) are caused by the most common sexually transmitted infection, human papillomavirus. The objective of this study was to examine AGW incidence from 1990 to 2011 by sex, age, income quintile, and residential area category (urban/rural). The study period included the initiation of school-based HPV vaccination for girls in the sixth grade, which began in 2008. The data presented in this paper may also be useful for establishing baseline rates of AGW incidence which may be used to evaluate the success of the school-based HPV immunization program.MethodsCases of anogenital warts were identified using Manitoba’s administrative databases of Physician Claims and Hospital Discharge s. Annual age-standardized incidence in Manitoba from 1990 to 2011 was calculated. Incident AGW rates were compared by sex, age group, residential area category (urban/rural), and household income quintile using logistic regression. Joinpoint regression analyses were used to evaluate the time trends of AGW.ResultsPrior to 2000, AGW incidence was higher among females than males. However, from 2000 to 2011 the incidence was higher among males and increased steadily over time. AGW incidence tended to peak in younger age groups among females compared to males. Females and males living in urban areas had nearly twice the odds of AGW occurrence compared to those in rural areas.ConclusionsThere is a need for education about AGW in male population. The upcoming initiation of HPV vaccination among boys may reduce the incidence and should be evaluated.Electronic supplementary materialThe online version of this article (doi:10.1186/s12889-016-2885-4) contains supplementary material, which is available to authorized users.
Highlights
Anogenital warts (AGW) are caused by the most common sexually transmitted infection, human papillomavirus
AGW incidence was higher among males at all age groups except 15–19; by age 25 the incidence was 1.5 to 2 times higher than females
* Correspondence: nancy.yu@umanitoba.ca 1Epidemiology and Surveillance Unit, Public Health and Primary Health Care Division, Manitoba Health, Healthy Living & Seniors, Winnipeg R3B 3 M9 Manitoba, Canada 2Centre for Global Public Health, University of Manitoba, Winnipeg, Canada Full list of author information is available at the end of the article. Both females and males living in urban areas had twice the odds of AGW occurrence compared to those in rural areas
Summary
Anogenital warts (AGW) are caused by the most common sexually transmitted infection, human papillomavirus. The objective of this study was to examine AGW incidence from 1990 to 2011 by sex, age, income quintile, and residential area category (urban/rural). The study period included the initiation of school-based HPV vaccination for girls in the sixth grade, which began in 2008. The data presented in this paper may be useful for establishing baseline rates of AGW incidence which may be used to evaluate the success of the school-based HPV immunization program. Anogenital warts (AGW) are caused by the most common sexually transmitted infection, human papillomavirus (HPV) [1]. It is estimated that 90 % of AGW are caused by HPV type 6 and HPV type 11 [3, 4].
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