TABLE 1.
Quality assessment of the included cohort studies based on the modified NOS, ordered alphabetically by author
| Study (Author, Year) | Score per modified NOS domain | Total score | Study quality | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |||
| Cohort studies | ||||||||||
| Ayrebe et al., 2020 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 6 | Poor |
| Bousquet G. et al., 2020 | 0 | 1 | 0 | 1 | 1 | 0 | 1 | 1 | 5 | Fair |
| Da‐xiong Zeng et al., 2020 | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 5 | Poor |
| Fauvel et. Al., 2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 | Good |
| Fraissé M. et al., 2020 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 4 | Poor |
| Giacomelli A. et al., 2020 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 6 | Poor |
| Gonzalez‐Porras J.R. et al., 2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7 | Good |
| Klok F.A. et al., 2020 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 3 | Poor |
| Li W. et al., 2020 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 6 | Good |
| Llitjos J‐F et al., 2020 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 3 | Poor |
| Middeldorp S. et al., 2020 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 4 | Poor |
| Paranjpe I. et al., 2020 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 0 | 4 | Poor |
| Rossi R. et al., 2020 | 0 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 4 | Poor |
| Sivaloganathan H. et al., 2020 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 5 | Fair |
| Tang N. et al., 2020 | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 5 | Poor |
| Tremblay D. et al., 2020 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 6 | Good |
| Trinh MA. et al., 2020 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 6 | Good |
| Vincenzo R. et al., 2020 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 5 | Poor |
| Zhang L. et al., 2020 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 6 | Poor |
| Case‐control studies | ||||||||||
| Koleilat et. al. | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 0 | 4 | Poor |
| Modified NOS scale domains for cohort studies: | ||||||||||
| Selection 1. Representativeness of the exposed cohort 2. Selection of the non‐exposed cohort 3. Ascertainment of exposure 4. Demonstration that outcome of interest was not present at start of study | ||||||||||
| Comparability 5. Comparability of cohorts on the basis of the design or analysis | ||||||||||
| Outcome 6. Assessment of outcome 7. Was follow‐up long enough for outcomes to occur 8. Adequacy of follow‐up of cohorts | ||||||||||
| Modified NOS scale domains for case‐control studies: | ||||||||||
| Selection 1‐ case definition 2‐ Representativeness of cases 3‐selection of controls 4‐ Definition of controls | ||||||||||
| Comparability 5‐ comparability of cases and controls | ||||||||||
| Exposure 6‐ ascertainment of exposure 7‐ same method of ascertainment for cases and controls 8‐ non‐response rate | ||||||||||
Abbreviation: NOS, Newcastle–Ottawa Scoring System.