Table 4.

HPV vaccine disinformation/misinformation subcategory predictors of retweets and combined audience engagement

Multivariable model	Retweet incidence rate ratio (95% CI)	Engagementa incidence rate ratio (95% CI)
Mandate	10.9 (10.6–11.3)	19.4 (19.0–19.8)
Other	3.7 (3.4–3.9)	6.03 (5.7–6.4)
Ineffective	3.2 (3.1–3.4)	3.8 (3.7–3.9)
Health	3.1 (2.9–3.2)	3.2 (3.1–3.2)
Safety	2.1 (2.0–2.2)	2.5 (2.4–2.6)
Vague	1.5 (1.4–1.6)	1.7 (1.6–1.8)
Pharma	0.68 (0.63–0.74)	0.79 (0.75–0.83)
Common	0.42 (0.31–0.56)	0.50 (0.42–0.59)
Government	0.40 (0.37–0.43)	0.41 (0.39–0.43)

Separate negative binomial model for each subcategory predictor controls for clustering by poster ID, gender, personal story, and age

^aAudience engagement = sum of retweet count, reply and favorite counts