Table 1 Risk of bias quality assessment
From: A systematic review and meta-analysis of long COVID symptoms
Selection (S) | Comparability (C) | Exposure/Outcome (E/O) | Sub Total assessment | Quality Assessment | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 1a | 1b | 1 | 2 | 3 | S+ | C& | E/O& | Conclusion | NOS | |
Akter et al | * | NO | * | * | * | * | * | * | * | Good | Good | Good | Good | 7 |
Huang et al | * | NO | * | * | NO | * | * | * | * | Good | Good | Good | Good | 6 |
Humphreys et al | * | NO | * | NO | * | NO | NO | * | * | Fair | Good | Good | Fair | 5 |
Simani et al | * | NO | * | * | NO | * | * | * | * | Good | Good | Good | Good | 6 |
Taylor et al | * | NO | * | * | NO | * | * | * | * | Fair | Good | Fair | Fair | 6 |
Felipe et al | NO | NO | * | * | * | * | * | * | * | Fair | Good | Good | Good | 6 |
Hopkins et al | * | NO | * | * | * | * | * | * | * | Good | Good | Good | Good | 7 |
Petersen et al | * | NO | * | * | * | * | * | * | * | Good | Good | Good | Good | 7 |
Iqbal et al | * | * | * | * | * | * | * | * | * | Good | Good | Good | Good | 8 |
Poncet-Megemont et al | * | * | * | * | * | * | * | * | * | Good | Good | Good | Good | 8 |
Trevisan et al | * | * | * | * | * | * | * | * | * | Good | Good | Good | Good | 7 |
Klein et al | * | NO | * | NO | * | NO | * | NO | NO | Fair | Good | Poor | Poor | 4 |
Munro et al | * | NO | NO | * | NO | NO | * | NO | NO | Fair | Poor | Fair | Poor | 4 |
Chopra et al | * | NO | * | * | NO | NO | * | NO | NO | Good | Poor | Fair | Fair | 5 |
Putri et al | * | NO | * | * | * | * | * | * | * | Good | Good | Good | Good | 7 |
Liu et al | * | NO | * | * | * | * | * | NO | NO | Good | Good | Fair | Good | 6 |
Tenforde et al | * | * | * | * | * | * | * | * | * | Good | Good | Good | Good | 8 |
Sykes et al | * | NO | * | * | * | * | * | * | * | Good | Good | Good | Good | 6 |
Townsend et al | * | NO | * | * | NO | * | * | * | * | Good | Fair | Good | Good | 7 |
Writing Committee for the COMEBAC study group, 2021 [6] | * | NO | * | * | * | * | * | NO | NO | Good | Good | Fair | Fair | 5 |
Augustin et al | * | NO | * | * | * | * | * | * | * | Good | Good | Good | Good | 6 |
Duncan et al | * | NO | * | NO | * | * | * | NO | NO | Fair | Good | Fair | Fair | 4 |
Osikomaiya et al | * | NO | * | * | * | * | * | * | * | Good | Good | Good | Good | 6 |
Orrù et al | * | * | * | * | * | * | * | * | * | Good | Good | Good | Good | 7 |
Pujari et al | * | NO | * | NO | * | * | * | * | * | Fair | Good | Good | Good | 6 |
Frontera et al | * | * | * | * | * | * | * | * | * | Good | Good | Good | Good | 7 |
Holmes et al | * | * | * | * | * | * | * | * | * | Good | Good | Good | Good | 7 |
Townsend et al | * | NO | * | NO | * | * | * | NO | NO | Fair | Good | Fair | Fair | 4 |
Estiri et al | * | NO | * | * | * | * | * | NO | NO | Good | Good | Fair | Fair | 5 |
Chevinsky et al | * | NO | * | * | * | * | * | NO | * | Good | Good | Good | Good | 6 |
Pereira et al | * | NO | * | * | * | * | * | NO | NO | Good | Good | Fair | Fair | 6 |
Romero-Duarte et al | * | NO | * | * | * | NO | * | NO | NO | Good | Fair | Fair | Fair | 5 |
Graham et al | * | NO | * | * | * | * | * | * | * | Good | Good | Good | Good | 7 |
Trinkmann et al | * | * | * | * | * | * | * | * | * | Good | Good | Good | Good | 7 |
Nguyen et al | * | NO | * | * | * | NO | * | NO | NO | Good | Fair | Fair | Fair | 5 |
Vrillon et al | * | NO | * | * | * | * | * | * | * | Good | Good | Good | Good | 7 |
Modi et al | * | NO | * | * | * | NO | * | NO | NO | Good | Fair | Fair | Fair | 4 |
Pasquini et al | * | NO | * | * | * | * | * | NO | NO | Good | Good | Fair | Good | 5 |
Boscolo-Rizzo et al | * | NO | NO | * | * | * | * | NO | NO | Fair | Good | Fair | Fair | 5 |
Capelli et al | * | NO | * | * | NO | * | * | NO | NO | Good | Fair | Fair | Fair | 4 |
Yvonne et al | * | * | * | * | * | * | * | * | * | Good | Good | Good | Good | 7 |
Raman et al | * | * | * | * | * | * | * | * | * | Good | Good | Good | Good | 7 |
Swapna Mandal et al | * | * | * | * | * | * | * | * | * | Good | Good | Good | Good | 6 |
Woo et al | * | NO | * | * | * | * | * | * | * | Good | Good | Good | Good | 6 |
Puntmann et al | * | NO | * | * | * | NO | * | * | * | Good | Fair | Good | Good | 5 |
Bellan et al | * | * | * | * | * | * | * | * | * | Good | Good | Good | Good | 7 |
Stavem et al | * | NO | * | * | * | * | * | * | * | Good | Good | Good | Good | 6 |
Malek et al | * | NO | * | * | NO | * | * | NO | NO | Good | Fair | Fair | Fair | 5 |
Printza et al | * | NO | * | NO | * | * | * | NO | NO | Fair | Good | Fair | Fair | 4 |