TABLE 1

Exclusions From Analyses Estimating Tdap VE, Duration of Protection, and Brand Effectiveness Against Pertussis

Reason excluded Cases (n = 887)Controls (n = 2599)
Pertussis case in previous yearsNot applicablea17 (0.7)
DTaP at adolescence2 (0.2)11 (0.4)
Tdap before age 105 (0.6)7 (0.3)
Two or more Tdap doses15 (1.7)77 (3.0)
Tdap vaccination status unknown29 (3.3)165 (6.3)
Total excluded from the analyses51 (5.8)277 (10.7)
  • Data are presented as n (%).

  • a Only controls were verified as to whether they had been reported as a pertussis case previously.