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Table 1 Characteristics of the studies included in the meta-analysis

From: The effects of statins on hyperandrogenism in women with polycystic ovary syndrome: a systematic review and meta-analysis of randomized controlled trials

Publication author, year

Country

Jadad score

Treatment arm A

Treatment arm B

Time of therapy

Sample size

Outcomes

Assessment method/Unit of primary outcome

Seyam 2018 [19]

Egypt

5

Simvastatin(20 mg/d)

+Metformin(1.5 g/d)

Metformin(1.5 g/d)

12 months

70/65

T,DHEA, Hirsutism

ELISA assay/ ng/ml

Seyam 2017 [24]

Egypt

4

Simvastatin(20 mg/d)

Placebo

6 months

100/100

T,DHEA, Hirsutism,Acne

chemiluminescence assays/ ng/ml

Puurunen 2013 [26]

Finland

5

Atorvastatin 20 mg/d

Placebo

6 months

15/13

T,DHEA, And

Liquid mass spectrometry/ nmol/l

Sathyapalan 2009 [22]

United Kingdom

5

Atorvastatin 20 mg/d

Placebo

3 months

19/18

T

Immunoassay/ nmol/l

Banaszewska 2011 [27]

Poland

3

Simvastatin(20 mg/d)

+Metformin(1.7 g/d)

Metformin(1.7 g/d)

6 months

36/33

T,DHEA, Hirsutism,Acne

enzymatic colorimetric assays/ ng/ml

Raja 2011 [25]

American

4

Atorvastatin(40 mg/d)

placebo

1.5 months

9/11

T,DHEA,And Hirsutism,Acne

not report/ ng/dl

Rashidi 2011 [20]

Iran

5

Simvastatin(20 mg/d)

placebo

2 months

32/29

T,DHEAS

chemiluminescence assays/ pg/ml

Kazerooni 2010 [21]

Iran

5

Simvastatin(20 mg/d)

+Metformin(1.5 g/d)

Metformin(1.5 g/d)

3 months

42/42

T,DHEA,Hirsutism

Radioimmunoassay/ ng/ml

Duleba 2005 [23]

Poland

2

simvastatin, 20 mg

+OCP

OCP

3 month

24/24

T,DHEA

chemiluminescence assays/ ng/dl

  1. T testosterone, DHEA dehydroepiandrosterone, And androstenedione, OCP oral contraceptive pills; containing 20 μg ethinyl E2 and 150 μg desogestrel