Table 2.
Quality assessment of included studies (NOS).
| Study | Selection | Demonstration that outcome of interest was not present at start of study | Comparability | Outcome | Total | ||||
| Representation of the exposed cohort | Selection of the non exposed cohort | Ascertainment of exposure | Comparability of cohorts on the basis of the design or analysis | Assessment of outcome | Was follow-up Long enough for outcomes to occur | Adequacy of follow-up of cohorts | |||
| Cai[25]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Bhatla[28]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Chao[29]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 6 | ||
| Wei[12]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | |
| Li[26]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Almazeedi[30]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Huang[13]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | |
| Wu[14]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | |
| Xiang[15]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | |
| Chen[16]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 6 | ||
| Xiong[17]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 8 | |
| Sun[18]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | |
| Mejía-Vilet[31]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Liu[19]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Peng[20]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 8 | |
| Simonnet[34]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 8 | |
| Dreher[35]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 6 | ||
| Regina[36]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Zhang[21]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | |
| Huang[22]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | |
| Al-Sabah[32]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Petrey[27]2021 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 8 | |
| Argenziano[33]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 6 | ||
| Brill[37]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Cao[38]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | |
| Garcia[39]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 8 | |
| Gayam[40]2021 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Krishnan[41]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | |
| Masetti[42]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 6 | ||
| Salacup[43]2021 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 8 | |
| Auld[44]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 6 | ||
| Luo[45]2021 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Zhang[46]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 6 | ||
| Klang[47]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 8 | |
| Halvatsiotis[48]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Halasz[49]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 6 | ||
| Giacomelli[61]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 8 | |
| Borobia[62]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Rossi[63]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Murillo-Zamoraa[64]2021 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Baqui[65]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Rodríguez[66]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 6 | ||
| Amit[67]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Goyal[58]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 6 | ||
| Petrilli[51]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Hur[59]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Carrillo-Vega[50]2020 | 1 | 1 | 1 | 2 | 1 | 6 | |||
| Shekhar[52]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 6 | ||
| Petrilli[51]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Ebinger[53]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Ferguson[54]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 6 | ||
| Lodigiani[55]2020 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 8 | |
| Hu[23]2020 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | |
| Itelman[56]2020 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 8 | |
| Caussy[60]2020 | 1 | 1 | 1 | 1 | 1 | 5 | |||
| Kalligeros[57]2020 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 9 |
| Wang[24]2021 | 1 | 1 | 2 | 1 | 1 | 6 | |||