TABLE 2

Demographic Characteristics of Cases and Controls Included in the Overall Estimation of 5-Dose DTaP Series VE

CharacteristicDTaP, n = 989
Case, n = 263Control, n = 726P
n%n%
Gender.88
 Female12647.934147.0
 Male13651.738352.8
 Unknown10.420.2
Ethnicity.99
 Hispanic10.450.7
 Non-Hispanic20778.752171.8
 Unknown5520.920027.5
Race.07
 White21682.154975.6
 Other62.3283.9
 Unknown4115.614920.5
Age at enrollment, y<.01a
 4–65420.524433.6
 7–86223.625435.0
 9–1014755.922831.4
Eligible for Vaccines for Children Program
 Yes11945.330141.5.23
 No10439.531243.0
 Unknown4015.211315.6
Insurance status
 Private12647.936550.3.54
 Medicaid11945.231443.2
 No coverage10.481.1
 Unknown176.5395.4
Vaccine statusb<.01
 Unvaccinated197.2111.5
 Vaccinated24492.871598.5
Median age at vaccination, y (range)
 Vaccinated5 (4–5)5 (4–5).32a
Median time since fifth-DTaP dose, mo (range)
 Vaccinated52 (33–64)35 (18–53)<.01a
  • P values presented are from matched ORs.

  • a Calculated using Wilcoxon rank-sum test.

  • b Participants classified as unvaccinated had no recorded pertussis-containing vaccines in their chart and had parental confirmation of nonreceipt; vaccinated participants had received 5 doses of DTaP on-schedule, defined as doses 1–3 at age <12 months, dose 4 at age 1 to <2 years, dose 5 at age 4 to <7 years.