TABLE 1.
Characteristics of Finnish and Russian subjects
| Characteristic | Mean (SD) for group
|
P value | |
|---|---|---|---|
| Finnish | Russian | ||
| n | 194 | 237 | |
| Age (yr) | 48.2 (13.6) | 44.8 (11.4) | 0.005a |
| Serum antibodies (EU) to: | |||
| A. actinomycetemcomitans | 4.69 (2.63) | 5.23 (3.09) | 0.05a |
| P. gingivalis | 5.68 (2.52) | 7.61 (2.92) | <0.001a |
| % of subjects with a high combined antibody response | 19.1 | 32.5 | <0.001b |
| Plasma vitamin C (mg/liter)c | 4.46 (2.76) | 1.41 (1.84) | <0.001a |
| No. of teeth | 20.6 (12.6) | 21.1 (9.4) | nsa,d |
| No. of fillings | 6.4 (5.7) | 2.1 (2.5) | <0.001a |
| CDT (U/liter) | 13.7 (7.7) | 20.9 (14.9) | <0.001a |
| Smokers (%) | 29.8 | 62.9 | <0.001b |
| Yr of education | 10.0 (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.