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Table 3 The results of the two-piecewise linear regression model

From: The association between dietary vitamin C intake and periodontitis: result from the NHANES (2009–2014)

Outcome

Periodontitis

 

OR (95%CI)

P value

Fitting by weighted linear regression model

0.9 (0.8, 1.0)

0.1355

Fitting by the weighted two-piecewise linear regression model

Inflection point

2.2

 

 < 2

0.8 (0.7, 1.0)

0.0094

 > 2

3.1 (1.4, 7.0)

0.0059

Log-likelihood ratio test

0.003

 
  1. Independent variable is Dietary Vitamin C intake (mg) log10 transform; the dependent variable is Periodontitis (binary variable); Covariates involved in this model were the same as presented in Fig. 2
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BMC Oral Health

ISSN: 1472-6831

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