TABLE 5.
Change in scores between test 1 and test 2, taken four weeks apart
| Question (see Table 1 for full text) | Mean score change (%) (95% confidence limits) | |
|---|---|---|
| Control group (n=73) | Study group (n=72) | |
| 1. Pertussis is caused by bacteria. | 26 (12–40) | 35 (23–46) |
| 2. Pertussis spreads easily from person to person. | 7 (−4±17) | 25 (13–37) |
| 3. Only babies get pertussis. | −4 (−13±5) | 6 (−3±14) |
| 4. Pertussis causes bad cough lasting three to four days. | −6 (−20±9) | 7 (−5±19) |
| 5. Babies often vomit and lose weight. | 10 (−1±20) | 44 (33–56)* |
| 6. Babies are always hospitalized. | 1 (−10±13) | 14 (1–27) |
| 7. Pertussis can cause convulsions. | 8 (−3±20) | 44 (33–56)* |
| 8. Pertussis can cause brain damage. | 19 (9–29) | 35 (22–47) |
| 9. Treatment cures pertussis in one to two days. | 6 (−4±15) | 6 (−5±16) |
| 10. Can get pertussis more than once. | 1 (−8±10) | 7 (−1±15) |
| 11. Pertussis vaccine contains living germs. | −3(−12±7) | −3 (−9±4) |
| 12. Pertussis vaccine causes fever in 50% of babies. | 19 (7–31) | 14 (2–26) |
| 13. Shot contains diphtheria, tetanus and pertussis vaccines. | 3 (−5±10) | 15 (7–24) |
| 14. Some babies cry for many hours after pertussis vaccine. | 19 (7–13) | 25 (13–37) |
| 15. Pertussis vaccine can cause convulsions. | 23 (12–35) | 26 (13–40) |
| 16. Pertussis vaccine often causes pain, redness and swelling. | 7 (−1±15) | 13 (4–21) |
| 17. Acetaminophen reduces some side effects. | 8 (2–14) | 7 (1–13) |
| 18. Only one injection of pertussis vaccine is needed. | 22 (12–32) | 25 (13–37) |
| 19. Pertussis vaccine protects for life. | 1 (−9±12) | 21 (8–34) |
| 20. The disease is much worse than reactions to vaccine. | 7 (1–13) | 3 (−3±8) |
| Mean change in score on 10 disease-related questions. | 7 (3±11) | 22 (17–27)† |
| Mean change in score on 10 vaccine-related questions. | 11 (7–14) | 15 (10–19) |
*
P<0.0001;
†
P<0.001