TABLE 1.

Characteristics of Finnish and Russian subjects

CharacteristicMean (SD) for groupP value
FinnishRussian
n194237
Age (yr)48.2 (13.6)44.8 (11.4)0.005a
Serum antibodies (EU) to:
    A. actinomycetemcomitans4.69 (2.63)5.23 (3.09)0.05a
    P. gingivalis5.68 (2.52)7.61 (2.92)<0.001a
% of subjects with a high combined antibody response19.132.5<0.001b
Plasma vitamin C (mg/liter)c4.46 (2.76)1.41 (1.84)<0.001a
No. of teeth20.6 (12.6)21.1 (9.4)nsa,d
No. of fillings6.4 (5.7)2.1 (2.5)<0.001a
CDT (U/liter)13.7 (7.7)20.9 (14.9)<0.001a
Smokers (%)29.862.9<0.001b
Yr of education10.0 (3.7)11.0 (3.1)0.003a
  • a t test.

  • b Chi-square test.

  • c 1 mg/liter = 5.68 μmol/liter.

  • d NS, not significant.