Table 6.

Cholera risk by the level of cholera vaccine coverage of the neighbourhood, in an individually randomized field trial in Bangladesh (adapted from [34]).

level of vaccine coverage (%)	target population		vaccinated group			placebo group
	n	%	n	cases	risk per 1000 persons*	n	cases	risk per 1000 persons**
<28	24 954	20.6	5627	15	2.66	2852	20	7.01
28–35	25 059	20.7	8883	22	2.47	4429	26	5.87
36–40	24 583	20.3	10 772	17	1.57	5503	26	4.72
41–50	24 159	19.9	11 513	26	2.25	5801	27	4.65
51+	22 394	18.5	12 541	16	1.27	6082	9	1.47
total	121 149	100	49 336	96	1.94	24 667	108	4.37

*p = 0.05 for trend.

**p < 0.0001 for trend.