Table 4 Bias assessment of the included randomized controlled studies
From: SARS-CoV-2 vaccine breakthrough infection in the older adults: a meta-analysis and systematic review
Included studies | Random allocation | Allocation concealment | Evaluation of blindness | Data integrity | Selective report | others |
|---|---|---|---|---|---|---|
Jerald Sadoff-2022.2 [27] | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk |
Raches Ella-2021.12 [28] | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk |
Hana M El Sahly-2021.11 [29] | Low risk | Low risk | Low risk | High risk | Low risk | Low risk |
Scott A Halperin -2022.1 [30] | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk |
Ann R. Falsey-2021.12 [31] | Low risk | Low risk | Low risk | Low risk | Low risk | High risk |
Karin Hardt-2022.9 [26] | Low risk | Low risk | Low risk | Low risk | Low risk | Unclear |