Covariates associated with completion of the three-dose vaccine series were accelerated vaccine schedule ( aOR 1.92 , 95 % CI 1.34 , 2.58 , p = < 0.001 ) , older age ( aOR 1.05 , 95 % CI 1.03 , 1.07 , p = < 0.001 ) , and poorer self-rated health score ( aOR 1.26 , 95 % CI 1.05 , 1.5 , p = 0.02 ) .