Categories and numbers of questions asked in Michigan HPV and Oropharyngeal Cancer (MHOC) study baseline and follow-up questionnaire.
| Question category | Number of questions | |
| Baseline | Follow-up | |
| Demographic | 8 | 5 |
| Oral health and cancer | 5 | 5 |
| STI testing and diagnosis | 17 | 12 |
| Sexual health and vaccinations | 25 | 16 |
| Sexual behaviour | 70 | 6 |
| Sexual partners | 22 | 18 |
| Substance use | 20 | 16 |
STI, sexually transmitted infection.