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Table 1 Quality assessment of the included studies using Newcastle–Ottawa Scale

From: Diagnostic accuracy of ultrasound in the diagnosis of Placenta accreta spectrum: systematic review and meta-analysis

 

Selection

Comparability

Outcome /Exposure

Abu-Hashim 2022 [26]

**

*

**

Al-Alfy 2021 [9]

***

*

**

Alchalabi 2017 [49]

***

**

**

Algebally 2014 [66]

***

*

**

Ayati 2017 [60]

***

*

**

Ballcacer 2016

**

*

**

Bassetty 2021 [61]

**

–––

**

Borg 2018 [28]

***

*

**

Bowman 2014 [51]

**

*

**

Budorick 2016 

**

*

**

Cali 2013 [20]

***

*

**

Chong 2018 [30]

***

*

**

Chou 2000 [65]

**

*

**

Comstock 2004 [62]

**

––––-

**

Davutoglu 2018 [31]

***

*

*

De Marcillac 2016 [24]

***

*

*

Dwyer 2008 [16]

**

*

**

El-Wakeel 2018 [59]

***

*

**

ElHawary 2013 [32]

**

*

**

Finberg 1992 [33]

**

–––––

*

Fishman 2011 [63]

**

*

**

Fitzpatrick 2013

**

*

**

Garofalo 2019 [35]

***

*

**

Guo 2021 [37]

***

*

**

Hamada 2011 [36]

****

**

***

Hamisa 2015 [34]

*

*

*

Japaraj 2007 [15]

**

–––––

*

Knight 2018 [53]

***

*

**

Kumar 2016

***

*

**

Lerner 1995 [38]

*

*

*

Lim 2011 [67]

**

*

**

Lopes 2019 [25]

***

*

**

Luo 2019 [43]

**

*

**

Maged 2018 [10]

***

*

**

Magied 2018 [64]

***

*

**

Maher 2013 [41]

***

**

***

Mansour 2011 [42]

**

*

**

Marsoosi 2018

***

*

**

Masselli 2008 [22]

**

*

**

Morel 2020

***

*

**

Nawab 2017

***

*

**

Peker 2013 [45]

***

*

*

Pillioni 2016 [46]

***

**

***

Rac 2014

**

*

**

Rekawek 2021 [56]

***

*

**

Rezk 2014

***

**

***

Riteau 2014 [17]

**

*

**

Romero 2021

***

*

**

Shih 2009 [19]

**

*

**

Shweel 2012 [48]

**

*

**

Twickler 2000 [21]

**

*

**

Warshak 2006 [58]

***

*

**

Xia 2020 [23]

**

*

**

Zhou 2014 [18]

**

*

**

  1. NOS 'star system' is based on three main perspectives: the selection of the study groups; the comparability of the groups; and the ascertainment of exposure (for case control) or outcome (for cohort) studies. Selection items included representative of exposed cohort, selection of non-exposed, ascertainment of exposure and whether the outcome of interest was demonstrated from the start of the study or not in cohort studies and included adequate case definition, representativeness of the cases, selection of Controls and definition of Controls in case–control studies. Comparability assessment include Comparability of cohorts (in cohort studies) or cases and controls (in case control studies) on the basis of the design or analysis. Ascertainment of the outcome in cohort studies included assessment of outcome, length of follow up and adequacy of follow up of cohorts. Assessment of exposure in case control studies included ascertainment of exposure, using the same method of ascertainment for cases and controls and non-response rate
  2. * low risk in 1 evaluation item
  3. **low risk in 2 evaluation item
  4. ***low risk in 3 evaluation item
  5. ****low risk in 4 evaluation item