Table 1 Visual representation of the quality of the included studies assessed through the Newcastle–Ottawa Scale (NOS)
Study | Selection | Comparability | Exposure | Final score | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Case definition adequate | Representativeness of cases | Selection of controls | Definition of controls | Main factor | Additional factors | Ascertainment of exposure | Same method of ascertainment for cases and controls | Non response-rate | X out of 9 | ||
Olsonn et al. [31] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 7/9 | |||
Borroni et al. [37] | ✓ | ✓ | ✓✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 8/9 | ||
Magdalinou et al. 2015 [36] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 9/9 | |
Hansson et al. [27] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 7/9 | |||
Hall et al. [28] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 7/9 | |||
Aerts et al. [15] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 8/9 | ||
Benvenuto et al. [33] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 7/9 | |||
Meteer et al. [24] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 7/9 | |||
Alcolea et al. [29] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 7/9 | |||
Borroni et al. [26] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 8/9 | |
Constantinides et al. [52] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 7/9 | |||
Luk et al. [35] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 8/9 | ||
Boman et al. [22] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 8/9 | ||
Jabbari et al. [34] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 7/9 | |||
Delaby et al. [25] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 7/9 | |||
Doss et al. [23] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 7/9 | |||
Quadalti et al. [20] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 8/9 | ||
Bjorkhem et al. [32] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 7/9 | |||
Schulz et al. [30] | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | 8/9 | ||