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Table 4 Frequency (Percent) of Parental Preference for Opt-In vs. Opt-Out and Immunization Registry (IRs) Support by Child's Vaccination Status

From: Support for immunization registries among parents of vaccinated and unvaccinated school-aged children: a case control study

  Vaccinated Exempt for Any Antigens Unadjusted Odds Ratio and 95% CIa,b Number of Antigens Exempt For
     1 2–5 6–9 10
Prefer Opt-Inc (32.7) 133 (50.0) 2.06 (1.55–2.71) 11 (35.5) 32 (44.4) 35 (63.6) 55 (50.9)*
Prefer Opt-Outd 342 (36.0) 54 (20.3) 0.45 (0.33–0.63) 10 (32.2) 19 (26.4) 6 (10.9) 19 (17.6)*
Don't Know 297 (31.3) 79 (29.7) 0.93 (0.69–1.25) 10 (32.3) 21 (29.2) 14 (25.5) 34 (31.5)
Total 950 (100.0%) 266 (100.0%)   31 (100.0%) 72 (100.0%) 55 (100.0%) 108 (100.0%)
Support IR regardless of choice 334 (34.7) 25 (9.3) 0.18 (0.12–0.28) 9 (30.0) 8 (11.3) 3 (5.3) 5 (4.5)*
Support IR because of choice 347 (36.0) 97 (36.1) 1.00 (0.76–1.33) 13 (43.3) 33 (46.5) 22 (38.6) 29 (26.1)
Do not support IR 72 (7.5) 76 (28.3) 4.87 (3.41–6.97) 2 (6.7) 16 (22.5) 20 (35.1) 38 (34.2)*
Don't Know 210 (21.8) 71 (26.3) 1.29 (0.95–1.77) 6 (20.0) 14 (19.7) 12 (21.0) 39 (35.2)*
Total 963 (100.0%) 269 (100.0%)   30 (100.0%) 71 (100.0%) 57 (100.0%) 111 (100.0%)
  1. a: Odds Ratio compares parents of children exempt for any antigens to parents of vaccinated children. Interpretation of odd ratio: Parents of exempt children had about 3 times as high odds of preferring opt-in compared with parents of vaccinated children.
  2. b: Odds Ratio in Bold P-Value < 0.05
  3. * Trend test is statistically significant at <0.05
  4. c: "opt-in" requires parental permission before any information about the child is entered into the registry
  5. d: "opt-out" registry is automatically populated using birth registry or other means and parents can then have all or part of their child's information removed