Table 3 Multifactorial regression analyses of CRP levels and periodontitis, stratified by sex, BMI and smoking status

CRP

1.2 (1.1, 1.3) 0.003

1.3 (1.1, 1.4) < 0.001

1.1 (1.0, 1.3) 0.171

CRP (tertile)

≤ 0.91

Ref

Ref

Ref

> 0.91, ≤ 1.9

1.2 (1.0, 1.4) 0.029

1.1 (1.0, 1.4) 0.118

1.0 (0.8, 1.3) 0.835

> 1.9

1.3 (1.1, 1.5) 0.003

1.4 (1.2, 1.7) < 0.001

1.1 (0.9, 1.4) 0.360

p for trend

0.003

< 0.001

0.362

Sex

 Male

1.4 (1.2, 1.8) 0.001

1.4 (1.1, 1.7) 0.006

1.1 (0.9, 1.4) 0.343

 Female

1.2 (1.0, 1.4) 0.017

1.2 (1.0, 1.4) 0.018

1.1 (0.9, 1.3) 0.364

BMI

 BMI < 25 kg/m²

2.2 (1.4, 3.5) < 0.001

1.7 (1.1, 2.8) 0.031

1.3 (0.8, 2.0) 0.298

 BMI ≥ 25 - <30 kg/m²

1.1 (0.9, 1.3) 0.314

1.1 (0.9, 1.3) 0.458

0.9 (0.8, 1.1) 0.397

 BMI ≥ 30 kg/m²

1.1 (0.9, 1.3) 0.244

1.3 (1.1, 1.5) 0.005

1.2 (1.0, 1.5) 0.045*

Smoking status

 never

1.1 (1.0, 1.3) 0.145

1.2 (1.0, 1.4) 0.031

1.1 (0.9, 1.3) 0.479

 former

1.2 (0.9, 1.5) 0.142

1.2 (0.9, 1.6) 0.124

1.0 (0.8, 1.3) 0.820

 current

1.3 (1.0, 1.7) 0.082

1.3 (0.9, 1.8) 0.123

1.3 (0.9, 1.8) 0.207