Table 1 The basic characteristics of the included studies

Huei-Jean Huang 2021 [9]

prospective

493

Hospital

N/A

Mean:40.9 range (20.2- 78.0)

2008-2014

China

NO

Yung-Taek Ouh 2020 [10]

retrospective

1029

Hospital

N/A

Mean:41.96±12.63

2014 - 2018

Korea

NO

M-E Fernandez-Montol 2020 [11]

retrospective

242

Hospital

N/A

Mean:37.4±10.9

2006-2016

Gynecology

NO

Aiping Fan 2018 [12]

retrospective

172

Hospital

N/A

Mean:39.1 range (23-70)

2006-2016

China

NO

Derya Kilic 2020 [13]

retrospective

395

Hospital

N/A

Mean:42.66±8.97

N/A

Turkey

NO

Anna So¨derlund-Strand 2014 [14]

prospective

178

Hospital

N/A

N/A

2001-2003

Sweden

NO

Rosario Lara-Peñaranda 2020 [15]

retrospective

265

Hospital

N/A

Mean:36.53±9.53

2011-2016

Spain

NO

Jung Mi Byun 2018 [16]

prospective

172

Hospital

Yes

Mean:39.4±10.7

2010 - 2014

Korea

NO

Kristin Friebe 2017 [17]

Prospective

144

Hospital

N/A

Mean:36.1 range( 21.8-68.5)

2007-2013

Germany

NO

Young-Tak Kim 2010 [18]

prospective

287

Hospital

N/A

Mean:40.7 range(19-67)

2000-2007

Korea

NO

Luca Giannella 2017 [19]

retrospective

298

Hospital

N/A

N/A

2012-2014

Italy

NO

Theresa Maria Kolben 2019 [20]

prospective

100

Hospital and German study centerst

N/A

Mean:31.6 range(23.8-47.3) and Mean:31.0 range(23.9-43.4)

2014-2016

Germany

YES

Immaculada Alonso 2006 [21]

retrospective

224

Hospital

N/A

Mean38.6 range( 22-83)

1998-2004

Barcelona

NO

Kyeong A So 2018 [22]

retrospective

160

Cheil General Hospital & Women’s Healthcare Center

N/A

Mean:38.1 range(18–86)

2014

Korea

NO

Kouichiro Kawano 2021 [23]

retrospective

439

Hospital

N/A

Mean:35 range(20–78)

2007-2016

Japan

NO

Jeong-Yeol Park 2009 [24]

prospective

115

Hospital

N/A

Mean:47 range(26–73) vs Mean:47 range(31–75)

2007-2008

Korea

NO

Lin Jing 2018 [25]

retrospective

594

Hospital

N/A

Mean:45 range(40-51) vs Mean:47 range(42.56)

2006-2015

China

NO

O.K. Vintermyr 2014 [26]

retrospective

58

Hospital

N/A

Mean:37.6 ±5.9

1998-2003

Norway

NO

A.L. Diste´fano 1998 [27]

prospective

36

Hospital

N/A

Mean:31 range (17 - 45)

N/A

Argentina

NO

Iztok Takaˇc 2008 [28]

prospective

797

Hospital

N/A

Mean: 39.9 range(29-70)

1999-2004

Slovenia

NO

J. E. Palmer 2016 [29]

retrospective

2093

Hospital

N/A

Mean:30 range(18–68)

2007-2012

UK

NO

Eralp Baser 2014 [8]

retrospective

292

Hospital

N/A

Mean:39.8 range(20–71)

2007-2012

Turkey

NO

Akihiro Karube 2021

prospective

169

Hospital

N/A

range 20–49

2008-2018

Japan

NO

Jeong-Yeol Park 2008 [30]

retrospective

236

Hospital

N/A

Mean:40 range(25–72) vs Mean:41 range(23–75)

2001-2016

Korea

NO

Lu´ıs Otávio Zanatta Sarian 2004 [31]

prospective

94

Hospital

N/A

Mean:34 range(20-60)

2001-2002

Brazil

NO

Akiko Kudoh 2016 [32]

retrospective

211

Hospital

N/A

Mean:34 range(20–72) vs Mean:37 range(18–79)

2009-2013

Japan

NO

SONIA ANDERSSON 2021 [33]

prospective

529

Hospital

N/A

Mean:34.3

2014-2017

Sweden

NO

Spinillo Arsenio 2020 [34]

retrospective

2985

Hospital

N/A

Mean:36.8 ± 10.4 range(21-65)

2010-2018

Italy

NO