4. Risk of bias assessment according to QUIPS (Quality in Prognostic Studies) for overall survival (OS) in interval debulking surgery (IDS) studies.
| Study |
Study participation |
Study attrition |
Prognostic factor measurement |
Outcome measurement |
Adjustment for other prognostic factors |
Statistical analysis and reporting |
| Cioffi 2018 | Low | Unclear | Low | Low | Low | Unclear |
| Davidson 2019 | Low | Unclear | Unclear | High | High | Unclear |
| Iwase 2015 | Unclear | Unclear | Low | Low | Low | High |
| Kaban 2017 | Unclear | Unclear | Low | Low | Unclear | High |
| Lecointre 2020 | Low | Unclear | Unclear | Low | High | Unclear |
| Lecuru 2019 | High | Unclear | Low | Low | High | High |
| Liu 2020 | Low | Unclear | Low | Low | High | High |
| Lorusso 2016 | High | Unclear | Low | Low | High | High |
| Petrillo 2014 | Low | Unclear | Low | Low | High | High |
| Phillips 2018 | Low | Unclear | Low | Low | High | High |
| Stoeckle 2014 | Low | Unclear | Low | Low | Unclear | Unclear |
| Zhang 2018 | Low | Unclear | Low | Low | Unclear | Unclear |
| Zhu 2016 | Low | Unclear | Unclear | Low | High | High |