Vaccination Index At age 2 m At age 4 m At age 6 m At age 12 m At age 12-24m
At age 2 m   0.994* 0.978* 0.630* 0.480*
At age 4 m     0.970* 0.630* 0.474*
At age 6 m       0.670* 0.520*
At age 12 m         0.760*
P ≤ 0.05
Table 6: Pearson correlations between the indices of vaccination during the first
two years of life.