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. Author manuscript; available in PMC: 2008 Nov 1.
Published in final edited form as: J Clin Epidemiol. 2007 Jun 7;60(11):1127–1131. doi: 10.1016/j.jclinepi.2007.02.009

Table 1.

Coding structure and covariate pattern, including interaction term, for Equation (9).

COVARIATE PATTERN VACCINE TERM TIME TERM AGE TERM TIME×AGE TERM LOG OR BASED ON MODEL 8
Not vaccinated 0 0 0 0 (referent)
Younger age at vaccination and vaccinated one year prior to disease 1 0 0 0 exp(ß1)
Younger age at vaccination and vaccinated 2-7 years prior to disease 1 1 0 0 exp(ß1 + ß2)
Older age at vaccination and vaccinated one year prior to disease 1 0 1 0 exp(ß1 + ß3)
Older age at vaccination and vaccinated 2-7 years prior to disease 1 1 1 1 exp(ß1 + ß2 + ß3 + ß4)