Percentage of infants with protective antibody titres ⩾ 1:8 for the poliovirus types 1, 2, and 3
↵3-150 p < 0.05 (A v B);
↵3-151 p < 0.05 (B v C);
↵3-152 p < 0.05 (Av C); all significance values follow Bonferroni's correction for multiple comparisons.
A, group A (n = 50); B, group B (n = 52); C, group C (n = 35); ND, not done.