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Table 1 Characteristics of participants in included studies

From: Effect of somatometric parameters on the prevalence and severity of varicocele: a systematic review and meta-analysis

Study

Year

Study design

Ethnicity

Country

Sample size

Age (years)

Included varicocele patients

Quality score

Varicocele

Non-varicocele

Handel et al. [16]

2006

Case-control

Caucasian

USA

1093

2120

NA

Left. right and bilateral

8

Kilic et al. [13]

2007

Case-control

Caucasian

Turkey

52

100

14–50

Left. right and bilateral

7

Tsao et al. [19]

2009

Cross-sectional

Asian

China

490

560

18–27

Left. right and bilateral

8

Chen et al. [18]

2010

Case-control

Asian

China

102

95

18–50

NA

7

Farhan et al. [27]

2010

Case-control

Asian

Iraq

206

206

NA

Left. right and bilateral

7

Chancwalters et al. [28]

2012

Case-control

Caucasian

USA

330

749

18–40

Left. right and bilateral

7

Soylemez et al. [21]

2012

Cross-sectional

Caucasian

Turkey

498

1563

19–34

Left. right and bilateral

7

Yigitler et al. [29]

2012

Cross-sectional

Caucasian

Turkey

750

11,831

16–23

NA

9

Özçelik et al. [30]

2013

Case-control

Caucasian

Turkey

75

100

20–30

NA

7

Rais et al. [31]

2013

Cross-sectional

Caucasian

Israel

47,398

1,275,663

17–18

NA

9

Gokce et al. [8]

2013

Cross-sectional

Caucasian

Turkey

587

1255

18–50

Right and bilateral

8

Doğantekin et al. [32]

2014

Cross-sectional

Caucasian

T urkey

210

390

21–38

Left. right and bilateral

7

Bae et al. [33]

2014

Case-control

Asian

Korea

211

102

NA

NA

7

Gorur et al. [34]

2015

Case-control

Caucasian

Turkey

138

117

18–45

NA

7

Liu et al. [35]

2015

Case-control

Asian

China

73

104

18–50

NA

7

Shafi et al. [36]

2015

Case-control

Asian

Iran

153

250

18–40

Left. right and bilateral

7

Liu et al. [7]

2017

Cross-sectional

Asian

China

1911

37,648

21–49

Left. right and bilateral

8

Pallotti et al. [3]

2018

Case-control

Caucasian

Italy

2085

2080

NA

Left. right and bilateral

7