TABLE 2.

Linear regression model for A. actinomycetemcomitans and P. gingivalis antibody levels with response variables added stepwise

Parameter and response variableβ (P)
Model IModel IIModel IIIModel IVModel V
A. actinomycetemcomitans antibodies (EU)a
    Vitamin C (mg/liter)b−0.06 (0.220)−0.07 (0.188)−0.04 (0.400)−0.05 (0.427)−0.08 (0.179)
    Age (yr)0.02 (0.035)0.04 (0.004)0.04 (0.007)0.04 (0.007)0.03 (0.043)
    + No. of teeth0.03 (0.045)0.04 (0.023)0.04 (0.024)0.04 (0.061)
    + No. of fillings−0.04 (0.250)−0.04 (0.279)−0.06 (0.132)
    + CDT (U/liter)0.00 (0.942)0.02 (0.235)
    + Smoking (cigarettes/day)−0.07 (0.000)
P. gingivalis antibodies (EU)
    Vitamin C (mg/liter)−0.20 (0.000)−0.21 (0.000)−0.13 (0.011)−0.12 (0.015)−0.14 (0.010)
    Age (yr)0.07 (0.000)0.07 (0.000)0.07 (0.000)0.07 (0.000)0.07 (0.000)
    + No. of teeth0.01 (0.423)0.04 (0.010)0.04 (0.011)0.04 (0.018)
    + No. of fillings−0.17 (0.000)−0.17 (0.000)−0.17 (0.000)
    + CDT (U/liter)0.02 (0.046)0.03 (0.023)
    + Smoking (cigarettes/day)−0.02 (0.345)
  • a Change in other variables/1-EU change in the antibody level.

  • b 1.0 mg/liter = 5.68 μmol/liter.