Table 2 Risk of bias among matched cohort studies
Study | Risk of biasa | ||||||
|---|---|---|---|---|---|---|---|
Due to Confounding | In Selection | In measurement classification of interventions | Due to deviations from intended interventions | Due to missing data | In measurement of outcomes | In selection of the reported results | |
Gårdlund [23]/1993 | Low | Low | Low | Low | Low | Low | Low |
Stegmayr [52]/1995 | Moderate | Moderate | Low | Low | Low | Low | Low |
Stegmayr [53]/1996 | Low | Low | Low | Low | Low | Low | Low |
Hjorth [54]/2000 | Low | Low | Low | Low | Low | Low | Low |
Schmidt [55]/2000 | Serious | Moderate | Low | Low | Low | Low | Low |
Ataman [56]/2002 | Serious | Serious | Moderate | Low | Low | Low | Low |
Stegmayr [57]/2003 | Moderate | Low | Low | Low | Low | Low | Low |
Hadem [32]/2014 | Low | Low | Low | Low | Low | Low | Low |
Knaup [58]/2018 | Low | Low | Low | Low | Low | Low | Low |
Keith [59]/2020 | Low | Low | Low | Low | Low | Low | Low |
Ahmed [60]/2020 | Low | Low | Low | Low | Low | Low | Low |
Gucyetmez [61]/2020 | Moderate | Low | Low | Low | Low | Low | Low |
Khamis [62]/2020 | Low | Low | Low | Low | Low | Low | Low |
Kamran [63]/2021 | Low | Low | Low | Low | Low | Low | Low |
Jaiswal [64]/2021 | Low | Low | Low | Low | Low | Low | Low |