CPa/FEb GEEc Vaccination 2.00 (0.36) 2.04 (0.38) Age (days) 366-426 -1.50 (0.55) -1.55 (0.61)                    427-487 -0.39 (0.44) -0.39 (0.42)                    488-548 -0.30 (0.42) -0.31 (0.44)                    549-609 -0.27 (0.42) -0.31 (0.43)                    610-670 -0.14 (0.41) -0.16 (0.42) aCP, conditional Poisson model. bFE, fixed effects model. cGEE, generalized estimation equations.

Table 4: Estimated coefficients (standard error) using parametric method from US MMR-ITP data.