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Table 2 Euroimmun assay results of 965 tested subjects according to age group

From: Seroprevalence of diphtheria toxoid IgG antibodies in children, adolescents and adults in Poland

Age groups (years) Number of tested sera Number (percentage) of sera with level of anti-diphtheria antibodies:
   <0.1 IU/ml 0.1-1.0 IU/ml >1-1.5 IU/ml >1.5-2.0 IU/ml >2.0 IU/ml
0-2 114 61 (53.5) 38 (33.0) 10 (8.8) 4 (3.5) 1 (0.8)
3-5 100 36 (36.0 49 (49.0) 7 (7.0) 7 (7.0) 1 (1.0)
6-13 133 41 (30.8) 77 (57.9) 9 (6.8) 5 (3.8) 1 (0,8)
14-18 70 16 (22.9) 48 (68.6) 4 (5.7) 2 (2.9) -
19-25 69 12 (17.4) 52 (75.4) 5 (7.2) - -
26-30 110 25 (22.7) 80 (72.7) 3 (2.7) 2 (1.8) -
31-40 145 34 (23.4) 103 (71.0) 6 (4.1) 1 (0.7) 1 (0.7)
41-50 80 51 (63.8) 29 (36.2) - - -
51-60 70 46 (65.7) 24 (34.3) - - -
>60 73 49 (67.1) 24 (32.9) - - -