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Table 1 Distribution of seroprotection against diphtheria in the Polish population according to age group

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

Age groups ≤18 years >18 years Total
Number of persons 417 970 1387
Titre < 0.1 IU/ml 154 (36.9%) 393 (40.5%) 547 (39.4%)
Titre 0.1-1.0 IU/ml 212 (50.8%) 542 (55.9%) 754 (54.4%)
Titre >1-1.5 IU/ml 30 (7.2%) 26 (2.7%) 56 (4.0%)
Titre >1.5-2 IU/ml 18 (4.3%) 6 (0.6%) 24 (1.7%)
Titre > 2.0 IU/ml 3 (0.7%) 3 (0.3%) 6 (0.4%)
Arithmetic mean titre (IU/ml) 0.409 0.274 0.310
Standard deviation (IU/ml) 0.559 0.324 0.414
Geometric mean titre (IU/ml) 0.141 0.102 0.108
Minimum (IU/ml) 0.001 0.001 0.001
Maximum (IU/ml) 4.480 1.740 4.480
Median (IU/ml) 0.210 0.150 0.160