Table 1

Mean time (in weeks) to infection by allele type/combination

Allele combination	Sample size	Number censored*	Mean time (weeks) to infection	95% confidence limits
*Number of children infection free at termination of study.
All infants	110	14	48	41 to 55
ε2/ε2	4	0	13	0 to 26
ε2/ε3	15	3	45	31 to 59
ε2/ε4	9	1	55	26 to 85
ε3/ε3	44	5	51	40 to 62
ε3/ε4	32	3	43	29 to 56
ε4/ε4	6	2	66	45 to 87
ε2 absent	82	10	49	41 to 58
ε2 present	28	4	44	31 to 57
ε3 absent	19	3	51	32 to 69
ε3 present	91	11	48	40 to 55
ε4 absent	63	8	48	39 to 57
ε4 present	47	6	48	37 to 59