Table 2.

Multifactorial regression analyses of BMI and periodontitis, stratified by sex, CRP level and smoking status

Exposure	Unadjusted model OR (95% CI) P	Adjusted Model I OR (95% CI) P	Adjusted Model II OR (95% CI) P
BMI	1.0 (1.0, 1.0) 0.279	1.0 (1.0, 1.0) 0.016	1.0 (1.0, 1.0) 0.532
BMI (categorical)
BMI < 25 kg/m2	Ref	Ref	Ref
BMI ≥ 25 and < 30 kg/m2	1.1 (0.9, 1.3) 0.436	0.9 (0.8, 1.1) 0.406	0.8 (0.7, 1.0) 0.098
BMI ≥ 30 kg/m2	1.1 (0.9, 1.3) 0.191	1.1 (0.9, 1.4) 0.192	1.0 (0.8, 1.2) 0.680
P for trend	1.1 (1.0, 1.1) 0.195	1.1 (1.0, 1.2) 0.114	1.0 (0.9, 1.1) 0.856
Sex
Male	1.0 (1.0, 1.0) 0.822	1.0 (1.0, 1.0) 0.432	1.0 (1.0, 1.0) 0.545
Female	1.0 (1.0, 1.0) 0.058	1.0 (1.0, 1.0) 0.015	1.0 (1.0, 1.0) 0.597
CRP level (tertile)
≤ 0.91	1.0 (1.0, 1.1) 0.060	1.0 (1.0, 1.0) 0.793	1.0 (1.0, 1.0) 0.371
> 0.91, ≤ 1.9	1.0 (1.0, 1.0) 0.816	1.0 (1.0, 1.0) 0.831	1.0 (1.0, 1.0) 0.490
> 1.9	1.0 (1.0, 1.0) 0.226	1.0 (1.0, 1.0) 0.417	1.0 (1.0, 1.0) 0.201
Smoking status
never	1.0 (1.0, 1.0) 0.290	1.0 (1.0, 1.0) 0.031	1.0 (1.0, 1.0) 0.347
former	1.0 (1.0, 1.0) 0.030	1.0 (1.0, 1.1) 0.006	1.0 (1.0, 1.0) 0.146
current	1.0 (1.0, 1.0) 0.360	1.0 (1.0, 1.0) 0.780	1.0 (0.9, 1.0) 0.153

Unadjusted model: not adjusted

Adjusted Model I: adjusted for age and sex

Adjusted Model II: adjusted for age, sex, race, marital status, annual family income level, alcohol consumption, hypertension, CRP, smoking status, COPD, cardiovascular disease, diabetes, flossing, and arthritis