Study	Reason for exclusion
Abravanel 2020	Index test ‐ no eligible time split
Adams 2020b	Index test ‐ assays could not be identified
Alger 2020	Population ‐ no data for sensitivity
Amanat 2020	Accuracy data cannot be extracted
Amrun 2020	Index test ‐ no eligible time split
Antoine‐Reid 2020	Index test ‐ no eligible time split
Arumugam 2020	Ineligible study design
Ayouba 2020	Index test ‐ no eligible time split
Barallat 2020	Study design ‐ not test accuracy
Baron 2020	Accuracy data cannot be extracted
Batra 2020	Index test ‐ no eligible time split
Becker 2020	Index test ‐ inhouse assay
Bendavid 2020	Index test ‐ cannot identify assay
Black 2020	Index test ‐ no eligible time split
Bortz 2020	Index test ‐ inhouse assay
Brandstetter 2020	Index test ‐ no eligible time split
Brantley 2020	Index test ‐ assay not identified
Brecher 2020	Population ‐ specificity only
Bruni 2020	Index test ‐ no eligible time split
Bryan 2020b	Index test ‐ no eligible time split
Buntinx 2020	Index test ‐ no eligible time split
Burbelo 2020	Index test ‐ inhouse assay
Byrnes 2020	Index test ‐ inhouse assay
Cai 2020	Index test ‐ inhouse assay
Cassaniti 2020	Index test ‐ no eligible time split
Chatzidimitriou 2020	Index test ‐ no eligible time split
Chen 2020a	Index test ‐ inhouse assay
Choe 2020	Index test ‐ no eligible time split
Chughtai 2020	Index test ‐ assay not identified
Colavita 2020	Index test ‐ no eligible time split
Comar 2020	Ineligible reference standard
Dahlke 2020	Inadequate sample size
Das 2020	Inadequate sample size
Demey 2020	Inadequate sample size
Di Lorenzo 2020	Index test ‐ no eligible time split
Dittadi 2020	Index test ‐ no eligible time split
Dobaño 2020	Index test ‐ inhouse assay
Dohla 2020	Index test ‐ cannot identify assay
Du 2020	Inadequate sample size
Edouard 2020	Index test ‐ inhouse assay
Erikstrup 2020	Index test ‐ no eligible time split
Espino 2020	Index test ‐ no eligible time split
Fong 2020	Index test ‐ inhouse assay
Freeman 2020	Index test ‐ inhouse assay
Garcia‐Basteiro 2020	Index test ‐ no eligible time split
Garcia Garmendia 2020	Inadequate sample size
Grzelak 2020	Index test ‐ inhouse assay
Guo 2020a	Index test ‐ inhouse assay
Guo 2020c	Ineligible population
Guthmiller 2020	Index test ‐ inhouse assay
He 2020	Index test ‐ no eligible time split
He 2020a	Index test ‐ no eligible time split
Hou 2020	Ineligible study design ‐ not test accuracy
Huang 2020a	Accuracy data cannot be extracted
Huang 2020b	Index test ‐ inhouse assay
Huang 2020c	Accuracy data cannot be extracted
Hung 2020	Index test ‐ no eligible time split
Imam 2020	Accuracy data cannot be extracted
Infantino 2020	Population pre‐selected ‐ all sero‐positive in week 1
Jia 2020	Index test ‐ no eligible time split
Jiang 2020b	Accuracy data cannot be extracted
Karp 2020	Index test ‐ no eligible time split
Karp 2020a	Index test ‐ inhouse assay
Klumpp‐Thomas 2020	Index test ‐ inhouse assay
Kruttgen 2020	Index test ‐ no eligible time split
Kushemererwa 2020	Index test ‐ assay not identified
Lahner 2020	Index test ‐ no eligible time split
Lapuente 2020	Index test ‐ no eligible time split
Lee 2020	Inadequate sample size
Lei 2020	Index test ‐ no eligible time split
Li 2020a	Index test ‐ no eligible time split
Li 2020b	Index test ‐ no eligible time split
Li 2020c	Index test ‐ no eligible time split
Li 2020d	Accuracy data cannot be extracted
Li 2020e	Index test ‐ no eligible time split
Lin 2020	Index test ‐ no eligible time split
Linares 2020	Paper withdrawn by authors; https://www.biorxiv.org/content/10.1101/2020.07.01.182618v2
Lippi 2020	Ineligible reference standard ‐ used EUROIMMUN ELISA
Liu 2020d	Index test ‐ cannot identify assay
Liu 2020e	Index test ‐ no eligible time split
Liu 2020f	Index test ‐ no eligible time split
Lopez de la Iglesias 2020	Index test ‐ no eligible time split
Ma 2020a	Index test ‐ inhouse assay
McAndrews 2020	Index test ‐ inhouse assay
Morley 2020	Index test ‐ inhouse assay
Munitz 2020	Index test ‐ inhouse assay
Mutnal 2020	Inadequate sample size
Nath 2020	Population ‐ specificity only
Nguyen 2020a	Inadequate sample size
Nie 2020	Ineligible study design
Norman 2020	Index test ‐ inhouse assay
Nuccetelli 2020	Index test ‐ no eligible time split
Okba 2020a	Ineligible study design ‐ not intended as test accuracy
Olivares 2020	Inadequate sample size
Ossareh 2020	Ineligible study design ‐ not test accuracy
Ozturk 2020	Inadequate sample size
Paradiso 2020a	Inadequate sample size
Paradiso 2020b	Accuracy data cannot be extracted
Patel 2020	Ineligible reference standard ‐ no reference standard
Pellanda 2020	Index test ‐ no eligible time split
Perkmann 2020	Index test ‐ no eligible time split
Phan 2020	Index test ‐ inhouse assay
Plebani 2020	Index test ‐ no eligible time split
Prince 2020	Ineligible reference standard ‐ serological consensus‐based
Qian 2020	Index test ‐ no eligible time split
Qu 2020	Index test ‐ no eligible time split
Rabets 2020a	Index test ‐ inhouse assay
Randad 2020	Index test ‐ inhouse assay
Robledo Gomez 2020	Index test ‐ no eligible time split
Rosado 2020	Index test ‐ inhouse assay
Rosendal 2020	Inadequate sample size
Rushworth 2020	Index test ‐ inhouse assay
Santos 2020	Index test ‐ no eligible time split
Serrano 2020	Index test ‐ no eligible time split
Shaw 2020	Index test ‐ inhouse assay
Solodky 2020	Index test ‐ no eligible time split
Song 2020	Inadequate sample size
Spicuzza 2020	Index test ‐ no eligible time split
Staines 2020	Accuracy data cannot be extracted
Steiner 2020	Index test ‐ inhouse assay
Strömer 2020	Index test ‐ no eligible time split
Sun 2020a	Accuracy data cannot be extracted
Tan 2020	Index test ‐ no eligible time split
Tan 2020a	Ineligible study design
Teng 2020	Population ‐ specificity only
Thevis 2020	Index test ‐ no eligible time split
To 2020a	Index test ‐ inhouse assay
Tre‐Hardy 2020	Inadequate sample size
Valenti 2020	Inadequate sample size
Van Praet 2021	Inadequate sample size
Varadhachary 2020	Index test ‐ no eligible time split
Vasarhelyi 2020	Index test ‐ no eligible time split
Vidal‐Anzardo 2020	Inadequate sample size
Villarreal 2020	Ineligible study design ‐ development phase; may be commercial assay
Wajnberg 2020	Inadequate reference standard
Wan 2020	Index test ‐ no eligible time split
Wang 2020b	Inadequate sample size
Wang 2020c	Accuracy data cannot be extracted
Wang 2020d	Accuracy data cannot be extracted
Wang 2020e	Accuracy data cannot be extracted
Wechselberger 2020	Ineligible reference standard ‐ composite based on 5 commercially available assays
Weiss 2020	Accuracy data cannot be extracted
Wen 2020	Index test ‐ inhouse assay
Wheeler 2020	Inadequate sample size
Woelfel 2020	Ineligible reference standard
Wu 2020a	Accuracy data cannot be extracted
Xiang 2020b	Index test ‐ no eligible time split
Xie 2020a	Accuracy data cannot be extracted
Xu 2020a	Index test ‐ inhouse assay
Xu 2020b	Index test ‐ no eligible time split
Xu 2020c	Inadequate sample size
Xue 2020	Inadequate sample size
Yamaoka 2021	Index test ‐ inhouse assay
Yan 2021	Accuracy data cannot be extracted
Yildirim 2020	Ineligible population ‐ all seropositive
Yokoyama 2020	Index test ‐ no eligible time split
Yu 2020	Index test ‐ inhouse assay
Yue 2020	Index test ‐ no eligible time split
Zeng 2020a	Ineligible stdy design
Zeng 2020b	Accuracy data cannot be extracted
Zhang 2020c	Index test ‐ inhouse assay
Zhang 2020d	Index test ‐ inhouse assay
Zhang 2020e	Index test ‐ no eligible time split
Zhang 2020f	Inadequate sample size
Zhao 2020b	Index test ‐ inhouse assay
Zhong 2020	Index test ‐ inhouse assay
Zhou 2020	Index test ‐ no eligible time split

ELISA: enzyme‐linked immunoabsorbent assay