Periodontal disease is associated with increased coronary heart disease risk: A meta-analysis based on 38 case-control studies

Table 2 Adjustments in case-control studies included in this meta-analysis

Ref.	Adjustment
López et al[14]	DM, systolic blood pressure, and smoking
Rutger Persson et al[17]	Smoking
Geerts et al[18]	Age, gender, smoking, DM, hypertension, hyperlipidemia, diet, and alcohol
Montebugnoli et al[19]	Age, smoking, DM, hypertension, high/low density lipoprotein, CRP, leukocytes, BMI, social class
Renvert et al[20]	Smoking
Buhlin et al[22]	Age, gender, smoking, DM, BMI, education, place of birth
Wang et al[24]	Gender, age, BMI, smoking, hypertension, DM, blood lipid, CRP, white blood count, and fibrinogen
Andriankaja et al[25]	Age, gender, hypertension, cholesterol, DM, and smoking
Briggs et al[27]	Smoking, education, alcohol, BMI, exercise, unemployment, hobby, plaque, and CRP
Geismar et al[28]	Gender, smoking, DM, and education
Spahr et al[30]	Age, sex, BMI, smoking, alcohol, DM, hypertension, hyperlipoproteinemia, education, exercise, and statin intake
Zhang et al[32]	Smoking, age, gender, BMI, hypertension, DM, high-density lipoproteincholesterol, total Cholesterol, total glycerin
Nonnenmacher et al[34]	Smoking and BMI
Rech et al[35]	Age, gender, smoking, DM
Ge et al[36]	Blood pressure and BMI
Zamirian et al[39]	Smoking and alcohol
Dong et al[41]	Smoking, age, and education
Sun et al[44]	Age and BMI
Willershausen et al[45]	Age, gender, and smoking
Ashraf et al[49]	Age, gender, and education
Zhang et al[50]	Age, gender, smoking, alcohol, hypertension, and BMI

DM: Diabetes mellitus; BMI: Body mass index; CRP: C-reactive protein.