Table 2.

Diphtheria immunity in population

Sample		Susceptibility <0.01 IU/ml			Basic protection 0.01-0.1 IU/ml			Full protection >0.1 IU/ml			GMC (IU/ml)	95%CI
	Total	N	%	95%CI	N	%	95%CI	N (%)	%	95%CI
Overall	2225	802	36.0	34.0-38.1	136	6.1	5.1-7.2	1287	57.8	55.8-59.9	0.05	0.04-0.06
Male	733	263	35.9	32.6-39.7	43	5.9	4.3-7.8	427	58.3	54.3-61.6	0.05	0.05-0.07
Female	1492	539	36.1	33.5-38.5	93	6.2	5.0-7.6	860	57.6	55.2-60.3	0.05	0.04-0.06