Table 2.

Numbers of immune and susceptible women to diphtheria and tetanus, by age group

	Target disease	Age group in years
Immunity (ATT IgG concentration)		30 – 39	40 – 49	50 – 59	60 – 69	70 – 98	Total
	Tetanus
Immune (≥160 mIU/ml)		16	20	22	12	14	84
Susceptible (<160 mIU/ml)		1	1	3	1	10	16
	Diphtheria
Immune (≥100 mIU/ml)		12	7	16	11	20	66
Susceptible (<100 mIU/ml)		5	14	9	2	4	34
	Total	17	21	25	13	24	*100

* 100 pre-vaccination sera