Table 1: Clinical characteristics of included studies.

Study (Year) Location Design Study Population N Confounders Assessed Age BMI Clinical Outcomes
Dursun
2011
Turkey Case-control study Non obese never smoker women with normal glucose tolerance and without history of systemic disease or any drug use (oral contraceptives for ≥ 3 months)
S: PCOS diagnosed with Rotterdam Criteria (n=25)
C: Age and weight matched systemically healthy women with regular menstrual cycles without clinical or biochemical hyperandrogenism or PCOS (n=27)
52 Cushing's syndrome, congenital adrenal hyperplasia, hyperprolactinemia, thyroid disorders, androgen secreting tumors, smoking, oral contraceptives use ≥3 months. BMI S: 22.7±3.6
C: 24.2±2.5
S:22.4±2.50
C: 20.6±1.9
CAL,PD,GI,%BOP,PI
Porwal
2014
India Case-control study Reproductive age women diagnosed with >16 natural teeth.
S: PCOS diagnosed with Rotterdam Criteria (nN=41, nM=45)
C: systemically healthy age matched regularly menstruating women with no clinical or biochemical sign of hyperandrogenism and ultrasound exclusion of PCOS (n=40)
126 Thyroid disorders, hyperprolactinemia, androgen-secreting tumors, chronic inflammatory diseases (nephrotic syndrome, chronic renal failure, significant cardiovascular disease, established type 1 or type 2 diabetes mellitus, or active cancer within the past 5 years), smoking, alcoholism, antibiotics within 3 months, periodontal treatment within 6 months, aggressive periodontitis and BMI N:23.09±4.90M:22.68±4.55
C:23.50±2.67
N: 25.01±3.61
M: 24.57±4.38
C: 23.76±4.82
CAL,PD,GI,%BOP,PI
Rahiminejad
2015
Iran Case-control study 18-45 years of age women with BMI<25 kg/m2 and without IGT in early follicular phase
S: PCOS diagnosed with Rotterdam Criteria (n=98)
C: systemically healthy women (n=98)
196 Pregnancy, smoking, malignancies, osteoporosis, BMI, IGT, thyroid diseases, hyperprolactinemia, Cushing’s syndrome, androgenic tumors, 21-hydroxylase deficiency, periodontal treatment or prophylactic antibiotic therapy during the past 6 months and hormonal effect of menstrual cycle S:29.06±6.56
C:28.60±6.37
S: 23.81±4.10
C: 24.02±3.50
CAL,PD,%BOP, PI, tooth loss
Nair
2017
India Case-control study 18-45 years of age women having minimum of 20 teeth in early follicular phase
S: PCOS diagnosed with Rotterdam Criteria (n=120)
C: systemically healthy women (n=120)
240 Pregnancy, smoking, alcoholism, malignancy, osteoporosis, periodontal treatment or prophylactic antibiotic therapy during the past 6 months and hormonal effect of menstrual cycle S: 23.40±4.47
C:23.6 ± 4.46
S: 24.39 ± 4.52
C: 22.09 ± 3.81
CAL,GI