Summary of participants, sampling and recruitment
| Participant group | N (approximate) | Sampling and recruitment method |
| Year 7 Aboriginal and Torres Strait Islander adolescents | 8–12 per school | Convenience sampling via school representative. Additional participants may be recruited via community events outside the school. Purposive sampling, as required, to include under-represented groups (eg, adolescents who did not receive vaccination) |
| Parents/caregivers of Year 7 Aboriginal and Torres Strait Islander adolescents (parents/caregivers may not identify as Aboriginal and Torres Strait Islander in all cases) | 8–12 per school | Convenience sampling via school representative. Purposive sampling, as required, to include under-represented groups (eg, parents/caregivers who did not provide consent for vaccination) |
| Local key informants (eg, individuals from the school involved in HPV vaccination programme delivery or administering council) | 3–6 per school | Purposive via principal and school representative, and via local council administering HPV vaccination delivery. Snowball sampling via participants |
| Immunisation programme partners (eg, individuals from the state health and education departments involved in HPV vaccination programme) | 3–6 in total | Purposive via Investigator networks, Consultation Network, local councils administering HPV vaccination and snowball sampling via participants |
HPV, human papillomavirus.