Table 4.
Summary of human papillomavirus (HPV) vaccine topics generated by the Latent Dirichlet Allocation (LDA) approach.
| Topic name | Topic keywords | Description |
| General vaccine debate (Topic 0) | peopl, immun, diseas, get, like, flu, one, hpv, caus, children | Broadly concerned with vaccine decision making; Vaccine safety; Risks of side effects; Importance of vaccination; Personal stories |
| HPVa-related cancer and genital warts (Topic 1) | hpv, strain, cancer, caus, wart, protect, type, infect, genit, genit-wart | HPV strains related to cancer and genital warts; Strains covered by vaccine |
| Sharing government links (Topic 2) | http, www, http-www, gov, cdc, cdc-gov, nih, www-cdc, nih-gov, nlm | Vaccine concerns corroborated by links to CDCb and PubMed research articles |
| HPV cancer prevention (Topic 3) | cancer, cervic, cervic-cancer, hpv, get, women, prevent, caus, hpv-vaccin, men | Gender-related vaccine and HPV concerns; cervical cancer; other HPV related cancers; recommendations for men and women |
| HPV-specific vaccine debate (Topic 4) | effect, gardasil, studi, report, gt, hpv, death, year, side, hpv-vaccin | Adverse events linked to HPV vaccination; Side effect risk; Vaccine efficacy; Debating facts (fewer personal stories than topic 0). |
| HPV vaccine political debate (Topic 5) | peopl, hpv, make, gt, would, like, hpv-vaccin, think, one thing | Parental vaccine rights; Reach of federal power; Abortion debate; Sexual education policy; General political debate; Individual politicians; Corruption |
| Sharing general links on HPV (Topic 6) | http, com, www, http-www, org, amp, en, hpv, comment, wikipedia | HPV concerns with links to news stories; Links to other Reddit threads; Generally sharing single links rather than a list of links (Topic 2) |
| HPV vaccination schedule (Topic 7) | get, hpv, hpv-vaccin, year, got, doctor, go, shot, age, girl | Age of vaccination; Preventive screenings; Medical advice; Personal stories; Deciding whether to vaccinate |
| Circumcision debate (Topic 8) | circumcis, men, gt, risk, women, male, hiv, infect, hpv, benefit | Risks and benefits of circumcision; Likelihood of contracting STIc; Cancer prevention |
| Sexual behaviors including HPV (Topic 9) | get, hpv, sex, test, condom, peopl, like, know, partner, std | Discussions of sexual behaviors; STI prevention; Vaccination; Condom use; Relationship norms |
aHPV: human papillomavirus.
bCDC: Centers for Disease Control and Prevention.
cSTI: sexually transmitted infection.