TABLE 5

Demographic Characteristics of Cases and Controls Included in the Overall Estimation of Tdap VE

CharacteristicTdap, n = 1462
Case, n = 372Control, n = 1090P
n%n%
Gender.22
 Female19753.052748.3
 Male17246.255851.2
 Unknown30.850.5
Ethnicity.99
 Hispanic20.560.6
 Non-Hispanic29078.081074.3
 Unknown8021.527425.1
Race.06
 White31384.184477.5
 Other102.7575.2
 Unknown4913.218917.3
Age at enrollment, y.45a
 11–1214238.237734.6
 13–1413235.543039.5
 15–199826.328326.0
Eligible for Vaccines for Children Program.06
 Yes14739.534631.7
 No15040.346142.3
 Unknown7520.228326.0
Insurance status.22
 Private18850.563358.0
 Medicaid14839.836633.6
 No coverage61.6161.5
 Unknown308.1756.9
Vaccine statusb<.01
 Unvaccinated11029.618016.5
 Vaccinated26270.491083.5
Birth year.99
 Birth year <199812834.437634.5
 Birth year >199724465.671465.5
Median age at vaccination, y (range)
 Vaccinated11 (11–12)12 (11–13).13a
Median time since Tdap, mo (range)
 Overall30 (18–42)26 (12–39)<.01a
 Birth year <199842 (34–54)42 (33–52).54a
 Birth year >199719 (12–28)15 (7–26)<.01a
  • P values presented are from matched odds ratios.

  • a Calculated using Wilcoxon rank-sum test.

  • b Participants classified as unvaccinated had no recorded Tdap in their chart and had parental confirmation of nonreceipt or had received a Tdap dose after or during the 14 days before enrollment; vaccinated participants had received 1 dose of Tdap at or after age 11 years.