TABLE 2

Risk of Pertussis Among Adolescents and Teenagers According to Vaccines Received During the First 2 y of Life, January 2010 to December 2011

Vaccine TypePCR-Positive Cases Compared WithOR95% CIP Value
4 DTaP versus 4 DTwPPCR-negative controlsa5.632.55–12.46<.001
KPNC-matched controlsb6.272.97–13.21<.001
Mixed DTwP/DTaP versus 4 DTwPPCR-negative controlsa3.771.57–9.07.003
KPNC-matched controlsb3.121.35–7.20.008
  • a Conditional logistic regression stratified by calendar time, and including covariates to adjust for gender, race or ethnic group, medical clinic, and Tdap vaccination status. This model deleted 2 observations for PCR-negative controls because of missing covariate data.

  • b Conditional logistic regression stratified by calendar time, gender, race or ethnic group, and medical clinic, and including a covariate to adjust for Tdap vaccination status.