Effects of Interventions on MMR Intention

AllVaccine Attitudes
Least FavorableSomewhat FavorableMost Favorable
Autism correction0.52* (0.32–0.84)0.36* (0.20–0.64)1.12 (0.36–3.52)2.98 (0.48–18.36)
Disease risks0.98 (0.54–1.77)0.96 (0.50–1.86)1.23 (0.29–5.30)0.82 (0.12–5.45)
Disease narrative1.09 (0.62–1.94)0.87 (0.45–1.68)2.26 (0.60–8.45)7.29 (0.64–82.77)
Disease images1.29 (0.73–2.26)1.20 (0.64–2.26)2.00 (0.71–5.67)0.86 (0.09–8.48)
Somewhat favorable toward vaccines (baseline: least favorable)7.61* (4.74–12.22)
Most favorable toward vaccines (baseline: least favorable)16.19* (7.16–36.59)
  • Ordered logit models with coefficients expressed as aORs and 95% confidence intervals in parentheses (cutpoints omitted; * P < 0.05). “MMR intention” measures responses on a 6-point scale from “Very unlikely” (1) to “Very likely” (6) to the question “If you had another child, how likely is it that you would give that child the measles, mumps, and rubella vaccine, which is known as the MMR vaccine?” Indicators for vaccine attitudes groups (least, somewhat, and most favorable) are based on a tercile split of responses to the vaccine attitudes scale from Freed et al,11 which was administered in a previous wave of the study. The experimental interventions are provided in the Supplemental Information.