First dose, study eligibility requires first dose before age 16 weeks | Second dose | Third dose | Primary coding, first wP versus first aP | Secondary (1) coding, any wP versus only aP | Secondary (2) coding, only wP versus only aP |
wP | Missing | Missing | wP1 | wP_mix | wP_only |
wP | wP | Missing | wP1 | wP_mix | wP_only |
wP | wP | wP | wP1 | wP_mix | wP_only |
wP | aP | aP or missing | wP1 | wP_mix | Not included |
wP | aP or missing | aP | wP1 | wP_mix | Not included |
aP | wP or missing | wP | aP1 | wP_mix | Not included |
aP | wP | wP or missing | aP1 | wP_mix | Not included |
aP | aP | aP | aP1 | aP_only | aP_only |
aP | aP | Missing | aP1 | aP_only | aP_only |
aP | Missing | Missing | aP1 | aP_only | aP_only |
aP, acellular pertussis; wP, whole-cell pertussis.