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Table 3 The results of the two-piecewise linear model

From: Serum 25-hydroxyvitamin D is negatively associated with severe periodontitis: a cross-sectional study

 

Severe periodontitis (OR, 95%CI)

p value

Fitting model by standard linear regression, per SD increments

0.75 (0.64, 0.89)

0.001

Fitting model by two-piecewise linear regression

  

Inflection point of lactate dehydrogenase, nmol/L

102

 

 ≤ 102

0.98 (0.98, 0.99)

0.001

 > 102

0.99 (0.98, 1.01)

0.798

  1. Adjusted: gender; hypertension; HDL-Cholesterol, age, race/Hispanic origin, glycohemoglobin, education level, diabetes mellitus, BMI, marital status, creatinine, health insurance, smoking status, ratio of family income to poverty
  2. BMI, body mass index; HDL, high-density lipoprotein; SD, standard deviation