Table 3

Percentage of infants with protective antibody titres ⩾ 1:8 for the poliovirus types 1, 2, and 3

Age		Poliovirus type 1			Poliovirus type 2			Poliovirus type 3
Age		A	B		C	A		B	C	A	B	C
24 hours	100	98	100	100	100	100	90^3-152	88^3-151	97
1 month	100	94	ND	100	98	ND	94^3-150	81	ND
3 months	100	98	100	100	98	100	98^3-150	85^3-151	100
7 months	98	100	100	100	100	100	100	98	100

↵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.