DPT and HBV (n = 155) were replaced with the pentavalent vaccine (n = 740) part way through the study hence children were eligible for one or other. Timeliness assumes a vaccine should be given within
Association of selected factors with missing the second vaccine dose (i.e. no dose up to 42 days from first dose) among persons who had at least 42 days of follow-up from the first dose.
