TABLE 3

Attitudes and Beliefs of Study Participants According to Study Group at the Pretest and Posttest

Treatment Group	Vaccines Are Safe, % (95% CI)	I Am Confident in the Safety of Routinely Recommended Vaccines, % (95% CI)	Multiple Vaccines at Once Do not Overload the Immune System, % (95% CI)	If I Vaccinate My Child, He or She Will Probably not Have a Serious Adverse Effect, % (95% CI)	Vaccines Are Necessary to Prevent Certain Diseases, % (95% CI)
Prenatal
At screening	77 (66–86)	73 (62–83)^a	62 (50–72)^a	46 (35–58)	92 (84–97)
After intervention	94 (86–98)	92 (84–97)^a	90 (82–95)^a	45 (34–57)	99 (93–100)
1 wk
At screening	80 (69–88)^a	73 (62–83)^a	50 (38–60)^a	21 (13–32)^a	97 (91–100)
After intervention	97 (91–100)^a	99 (93–100)^a	80 (69–88)^a	52 (40–64)^a	93 (85–98)
2 mo
At screening	89 (78–95)	85 (74–93)	56 (42–68)^a	23 (13–36)	93 (84–98)
After intervention	95 (86–99)	92 (82–97)	82 (70–91)^a	34 (23–48)	93 (84–98)

The all-time-points group was analyzed separately. Results: Vaccines are safe, at screening = 98% (90–100), after intervention = 98% (95% CI: 90–100); I am confident in the safety of routinely recommended vaccines: at screening = 96% (95% CI: 87–100), after intervention = 96% (95% CI: 87–100); Multiple vaccines at once do not overload the immune system: at screening = 96% (95% CI: 87–100), after intervention = 100% (95–100); If I vaccinated my child, he/she will probably not have a serious side effect: at screening = 38% (95% CI: 25–52), after intervention = 49% (95% CI: 35–63); and Vaccines are necessary to prevent certain diseases: at screening = 98% (95% CI: 90–100), after intervention = 98% (95% CI: 90–100). CI indicates confidence interval.
↵a Statistically significant.