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INTRODUCTION: Aboriginal and Torres Strait Islander women experience a higher burden of cervical cancer than non-Indigenous women in Australia. Cervical cancer is preventable partly through human papillomavirus (HPV) vaccination; in Australia, this is delivered through the national school-based immunisation programme. While HPV vaccination uptake is high among Australian adolescents, there remain gaps in uptake and completion among Aboriginal and Torres Strait Islander adolescents. This study aims to gain a comprehensive understanding of the barriers and facilitators to HPV vaccination uptake and completion among Aboriginal and Torres Strait Islander adolescents in Queensland, Australia. METHODS AND ANALYSIS: The study will be guided by an Indigenist research approach and an ecological model for health promotion. Yarning, a qualitative Indigenous research method, will be conducted in up to 10 schools. Participants will include Year 7 (12/13 years old) Aboriginal and Torres Strait Islander adolescents; parents/caregivers; and local key informants and immunisation programme partners involved in the delivery of school-based HPV immunisation programme. Participants will be recruited through school representatives and investigator networks using purposive and snowball sampling and samples of convenience. Field notes, HPV vaccination clinic observations and sequential diagramming of the HPV vaccination process will be conducted. Thematic analysis of data will be led by Aboriginal and Torres Strait Islander researchers. Synthesised sequential diagrams of the process of HPV vaccination and qualitative themes summarising key findings will be produced. ETHICS AND DISSEMINATION: The Aboriginal Health and Medical Research Council of New South Wales Ethics Committee (1646/20), the Australian National University Human Research Ethics Committee (HREC, 2020/478), the HREC of the Northern Territory Department of Health and Menzies School of Health Research (19-3484) and the Townsvil

OBJECTIVE: There are limited data on the patterns of early sexual behaviours among Australian teenage heterosexual boys. This study describes the nature and onset of early sexual experiences in this population through a cross-sectional survey. DESIGN: A cross-sectional survey between 2014 and 2015 SETTING: Major sexual health clinics and community sources across Australia PARTICIPANTS: Heterosexual men aged 17-19 years RESULTS: There were 191 men in the study with a median age of 19.1 years. Median age at first oral sex was 16.4 years (IQR: 15.5-17.7) and 16.9 years (IQR: 16.0-18.0) for first vaginal sex. Most men had engaged in oral sex (89.5%) and vaginal sex (91.6%) in the previous 12 months with 32.6% reporting condom use at last vaginal sex. Of the total lifetime female partners for vaginal sex reported by men as a group (n=1187): 54.3% (n=645) were the same age as the man, 28.3% (n=336) were a year or more younger and 17.4% (n=206) were a year or more older. Prior anal sex with females was reported by 22% with 47% reporting condom use at last anal sex. Median age at first anal sex was 18.2 years (IQR: 17.3-18.8). Anal sex with a female was associated with having five or more lifetime female sexual partners for oral and vaginal sex. CONCLUSIONS: These data provide insights into the trajectory of sexual behaviours experienced by teenage heterosexual boys following sexual debut, findings which can inform programme promoting sexual health among teenage boys.

OBJECTIVE: To evaluate the feasibility and reliability of record linkage of existing population-based data sets to determine Indigenous status among women receiving Pap smears. This method may allow for the first ever population measure of Australian Indigenous women's cervical screening participation rates. SETTING/PARTICIPANTS: A linked data set of women aged 20-69 in the Queensland Pap Smear Register (PSR; 1999-2011) and Queensland Cancer Registry (QCR; 1997-2010) formed the Initial Study Cohort. Two extracts (1995-2011) were taken from Queensland public hospitals data (Queensland Hospital Admitted Patient Data Collection, QHAPDC) for women, aged 20-69, who had ever been identified as Indigenous (extract 1) and had a diagnosis or procedure code relating to cervical cancer (extract 2). The Initial Study Cohort was linked to extract 1, and women with cervical cancer in the initial cohort were linked to extract 2. OUTCOME MEASURES: The proportion of women in the Initial Cohort who linked with the extracts (true -pairs) is reported, as well as the proportion of potential pairs that required clerical review. After assigning Indigenous status from QHAPDC to the PSR, the proportion of women identified as Indigenous was calculated using 4 algorithms, and compared. RESULTS: There were 28,872 women (2.1%) from the Initial Study Cohort who matched to an ever Indigenous record in extract 1 (n=76,831). Women with cervical cancer in the Initial Study Cohort linked to 1385 (71%) records in extract 2. The proportion of Indigenous women ranged from 2.00% to 2.08% when using different algorithms to define Indigenous status. The Final Study Cohort included 1,372,823 women (PSR n=1,374,401; QCR n=1955), and 5,062,118 records. CONCLUSIONS: Indigenous status in Queensland cervical screening data was successfully ascertained through record linkage, allowing for the crucial assessment of the current cervical screening programme for Indigenous women. Our study highlights the need to incl