TABLE 4.

Scores of 151 mothers on test 1

Question (See Table 1 for full text)	Mean percentage (95% confidence limits) with correct answer
1. Pertussis is caused by bacteria.	44 (36–52)
2. Pertussis spreads easily from person to person.	66 (58–73)
3. Only babies get pertussis.	87 (81–92)
4. Pertussis causes bad cough lasting three to four days.	40 (32–48)
5. Babies often vomit and lose weight.	52 (44–60)
6. Babies are always hospitalized.	44 (36–52)
7. Pertussis can cause convulsions.	57 (49–65)
8. Pertussis can cause brain damage.	48 (40–56)
9. Treatment cures pertussis in one to two days.	29 (22–36)
10. Can get pertussis more than once.	13 (7–18)
11. Pertussis vaccine contains living germs.	15 (10–21)
12. Pertussis vaccine causes fever in 50% of babies.	68 (61–76)
13. Shot contains diphtheria, tetanus and pertussis vaccines.	86 (81–92)
14. Some babies cry for many hours after pertussis vaccine.	59 (51–67)
15. Pertussis vaccine can cause convulsions.	52 (44–60)
16. Pertussis vaccine often causes pain, redness and swelling.	85 (79–91)
17. Acetaminophen reduces some side effects.	92 (88–96)
18. Only one injection of pertussis vaccine is needed.	63 (55–71)
19. Pertussis vaccine protects for life.	27 (19–34)
20. The disease is much worse than reactions to vaccine.	91 (86–95)
Mean score on 10 disease-related questions.	48 (41–54)*
Mean score on 10 vaccine-related questions.	64 (59–69)*

^*99.9% confidence limits of the mean