Table 1: Perceptions of vaccine information sources among parents who did or did not use the Internet for vaccine information.

Information sourceInternet used as a source of vaccine information Unadjusted OR  
(95% CI)
Adjusted OR (95% CI)
Yes ( )*No ( )*
Good or excellent source (%)Good or excellent source (%)

Printed materials from health-care provider (Vaccine Information Statements)141 (58.0%)785 (80.9%)0.33 (0.24–0.44)0.49 (0.35–0.69)
Professional organizations, such as doctors/nurses’ associations130 (60.5%)691 (80.0%)0.38 (0.28–0.53)0.56 (0.39–0.80)
US Centers for Disease Control and Prevention (CDC) and the National Immunization Program154 (68.4%)757 (85.0%)0.38 (0.27–0.54)0.57 (0.39–0.83)
Health-care provider’s advice170 (68.8%)834 (85.1%)0.39 (0.28–0.53)0.59 (0.42–0.85)
Local or state health departments140 (59.6%)729 (78.0%)0.42 (0.31–0.56)0.60 (0.43–0.84)
Religious leaders and organizations13 (6.5%)65 (8.0%)0.79 (0.43–1.47)0.81 (0.43–1.52)
US Food and Drug Administration (FDA)105 (50.2%)526 (61.6%)0.63 (0.46–0.85)0.83 (0.60–1.15)
Pharmacists107 (48.9%)504 (56.8%)0.73 (0.54–0.98)0.97 (0.71–1.33)
Vaccine companies54 (23.2%)251 (28.8%)0.75 (0.53–1.05)0.98 (0.69–1.40)
Parents/Friends82 (34.0%)300 (32.3%)1.08 (0.80–1.46)1.03 (0.76–1.41)
Media (TV, radio, newspapers, books, magazines)77 (32.6%)273 (29.6%)1.15 (0.85–1.57)1.18 (0.86–1.62)
National Academy of Sciences, Institute of Medicine (IOM)101 (66.0%)432 (64.5%)1.07 (0.74–1.55)1.22 (0.83–1.80)
Dissatisfied Parents Together (DPT)46 (30.3%)127 (19.7%)1.77 (1.19–2.64)1.22 (0.79–1.87)
Alternative health care providers, such as chiropractors or acupuncturists104 (50.0%)271 (33.5%)1.98 (1.46–2.70)1.55 (1.12–2.14)
National Vaccine Information Center152 (78.0%)600 (76.1%)1.12 (0.76–1.61)1.69 (1.12–2.55)
Internet134 (56.3%)291 (35.2%)2.37 (1.77–3.18)2.45 (1.80–3.32)

*Not all respondents in each Internet use group completed each Likert scale for their perceptions of the listed information sources. and % values presented are relative the non-missing responses for each scale.
Adjusted for presence of any vaccine exemption.
Counts presented represent the count of non-missing data, and the corresponding percentage is the percent of respondents in each Internet usage group with non-missing data that indicated that a given information source was a “Good or excellent source”. Missing data were not consistent over information source. Odds ratios are calculated based on non-missing results through unadjusted and adjusted logistic regression.