Table 1.
Characteristics of the included studies.
| Study | Date of publication | Country | Study design | Language of publication | Study period | No. of pregnant women confirmed with COVID-19 (n) | Maternal age, y (range) | Gestational age at delivery, week (range) | Funding |
|---|---|---|---|---|---|---|---|---|---|
| Zhu et al. (22) | Feb. 6, 2020 | China | Case series | English | 1.20~2.05 | 9 | 25~35 | 31~39 | No |
| Li et al. (23) | Feb. 19, 2020 | China | Case report | Chinese | 1.29~2.02 | 1 | 27 | 38 | No |
| Wang et al. (24) | Feb. 28, 2020 | China | Case report | English | 2.05~2.18 | 1 | 28 | 30 | Yes |
| Chen et al. (25) | Mar. 2, 2020 | China | Case reports | Chinese | 1.21~2.25 | 3 | 23~34 | 35~38+6/7 | No |
| Lei et al. (26) | Mar. 2, 2020 | China | Case series | Chinese | 1.22~2.01 | 9 | 29~35 | 34+2/7~37 +5/7 |
No |
| Yao et al. (27) | Mar. 2, 2020 | China | Case report | Chinese | 2.11~2.25 | 1 | 22 | 38+2/7 | No |
| Zhao et al. (28) | Mar. 6, 2020 | China | Case report | Chinese | 1.31~2.13 | 1 | Not reported | 35+5/7 | No |
| Bai et al. (29) | Mar. 6, 2020 | China | Case report | Chinese | 2.01~2.15 | 1 | Not reported | 37+1/7 | No |
| Kang et al. (30) | Mar. 11, 2020 | China | Case report | Chinese | 2.06~2.24 | 1 | 30 | 35+4/7 | No |
| Chen et al. (31) | Mar. 16, 2020 | China | Case reports | English | Not mention | 4 | 23~34 | 37+2/7~39 | Yes |
| Zhou et al. (32) | Mar. 16, 2020 | China | Case report | Chinese | 2.12~2.21 | 1 | 30 | 37+3/7 | No |
| Khan et al. (33) | Mar. 19, 2020 | China | Case reports | English | 1.28~3.01 | 3 | 27~33 | 34+6/7~39 +1/7 |
Yes |
| Li et al. (34) | March 20, 2020 | China | Case-control study | English | 1.24~2.29 | 16 | 26~37 | 33+6/7~40 +4/7 |
Yes |
| Yu et al. (35) | March 24, 2020 | China | Case series | English | 1.01~2.08 | 7 | 29~34 | 37~41+2/7 | Yes |
| Zeng et al. (36) | Mar. 26, 2020 | China | Case series | English | 1.30~2.15 | 33 | Not reported | 31+2/7~ 40+4/7 |
No |
| Zeng et al. (37) | Mar. 26, 2020 | China | Case series | English | 2.16~3.06 | 6 | Not reported | Not reported | Yes |
| Dong et al. (38) | Mar. 27, 2020 | China | Case report | English | 1.28~2.22 | 1 | 29 | 34+2/7 | Yes |
| Chen et al. (39) | Mar. 28, 2020 | China | Case series | English | 1.20~2.10 | 5 | 25~31 | 38+6/7~40 +4/7 |
Yes |
| Baud et al. (40) | Mar. 30, 2020 | Switzerland | Case report | English | 3.18~3.22 | 1 | 28 | 19 | No |
| Lee et al. (41) | Mar. 31, 2020 | Korea | Case report | English | 3.06~3.11 | 1 | 28 | 37+6/7 | No |
| Kalafat et al. (42) | Apr. 6, 2020 | Turkey | Case report | English | 3.20-3.28 | 1 | 32 | 35+3/7 | No |
| Gidlöf et al. (43) | Apr. 6, 2020 | Sweden | Case report | English | Not mention | 1 | 34 | 36+2/7 | No |
| Peng et al. (44) | Apr. 6, 2020 | China | Case report | English | 2.05~2.19 | 1 | 25 | 35+3/7 | No |
| Breslin et al. (45) | Apr. 9, 2020 | USA | Case series | English | 3.13~3.27 | 43 | 20~39 | 32~39 | No |
| Xiong et al. (46) | Apr. 10, 2020 | China | Case report | English | 3.7~3.10 | 1 | 25 | 38+4/7 | No |
| Khassawneh et al. (47) | Apr. 14, 2020 | Jordan | Case report | English | 3.23~3.26 | 1 | 30 | 36+3/7 | No |
| Schnettler et al. (48) | Apr. 14, 2020 | USA | Case report | English | 3.24-4.10 | 1 | 39 | 34+1/7 | No |
| Liu et al. (49) | Apr. 14, 2020 | China | Case series | English | 1.31~2.29 | 19 | 26~38 | 35+2/7~41 +2/7 |
No |
| Carosso et al. (50) | Apr. 14, 2020 | Italy | Case report | English | Not mention | 1 | 28 | 37 | No |
| González Romero (51) | Apr. 17, 2020 | Spain | Case report | Spanish | Not mention | 1 | 44 | 29+2/7 | No |
| Koumoutsea et al. (52) | Apr. 17, 2020 | Canada | Case report | English | Not mention | 2 | 23~40 | 35+3/7~35 +5/7 |
No |
| Zamaniyan et al. (53) | Apr. 17, 2020 | Iran | Case report | English | 3.7~3.26 | 1 | 22 | 32 | No |
| Alzamora et al. (54) | Apr. 18, 2020 | Peru | Case report | English | 3.29~4.03 | 1 | 41 | 33 | No |
| Lyra et al. (55) | Apr. 20, 2020 | Portugal | Case report | English | Not mention | 1 | 35 | 39+6/7 | No |
| Al-kuraishy et al. (56) | Apr. 21, 2020 | Iraq | Case report | English | 3.13~3.30 | 1 | 25 | 30 | No |
| Lu et al. (57) | Apr. 24, 2020 | China | Case report | English | 2.11~2.17 | 1 | 22 | 38 | Yes |
| Ferrazzi et al. (58) | Apr. 27, 2020 | Italy | Case series | English | 3.01~3.20 | 42 | 21~44 | Not reported | No |
| Hantoushzadeh et al. (59) | Apr. 28, 2020 | Iran | Case series | English | 2.15~3.15 | 9 | Not reported | 28~38+3/7 | Yes |
| Penfield et al. (60) | May 3, 2020 | USA | Case series | English | 3.01~4.20 | 32 | 22~40 | 26+5/7~41 +3/7 |
No |
| Wu et al. (61) | May 5, 2020 | China | Case series | English | 1.31~3.09 | 13 | 26~40 | 16~38+4/7 | Yes |
| Piersigilli et al. (62) | May 7, 2020 | Belgium | Case report | English | 3.01~3.15 | 1 | Not reported | 26+4/7 | No |
| Blauvelt et al. (63) | May 8, 2020 | USA | Case report | English | Not mention | 1 | 34 | 28+6/7 | Yes |
| Pierce-Williams et al. (64) | May 8, 2020 | USA | Cohort study | English | 4.20~5.05 | 64 | Not reported | Not reported | No |
| Valente et al. (65) | May 10, 2020 | Portugal | Case report | English | 3.17~3.19 | 1 | 31 | 38 | No |
| Liu et al. (66) | May 11, 2020 | China | Case series | English | 1.20~3.03 | 51 | Not reported | 35+1/7~41 +2/7 |
Yes |
| Perrone et al. (67) | May 11, 2020 | Italy | Case reports | English | 3.01~4.30 | 4 | 26~36 | 38+2/7~40 +4/7 |
No |
| Baergen et al. (68) | May 12, 2020 | USA | Case series | English | Not mention | 20 | 16~41 | 32+2/7~40 +4/7 |
No |
| Taghizadieh et al. (69) | May 13, 2020 | Iran | Case report | English | Not mention | 1 | 33 | 34 | No |
| Patanè et al. (70) | May 14, 2020 | Italy | Case series | English | 3.05~4.21 | 22 | Not reported | Not reported | No |
| Kirtsman et al. (71) | May 14, 2020 | Canada | Case report | English | Not mention | 1 | 40 | 35+5/7 | No |
| Dória et al. (72) | May 15, 2020 | Portugal | Case series | English | 3.25~4.15 | 10 | 27~40 | 37~41 | No |
| Mehta et al. (73) | May 16, 2020 | USA | Case report | English | Not mention | 1 | 39 | 27 | No |
| Chen et al. (74) | May 16, 2020 | China | Case series | English | Not mention | 17 | Not reported | Not reported | No |
| Sharma et al. (75) | May 17, 2020 | India | Case report | English | Not mention | 1 | Not reported | 38+6/7 | No |
| Xia et al. (76) | May 17, 2020 | China | Case report | English | 1.23~2.20 | 1 | 27 | 37+2/7 | Yes |
| Panichaya et al. (77) | May 18, 2020 | Thailand | Case report | English | Not mention | 1 | 43 | 18 | No |
| Lokken et al. (78) | May 18, 2020 | USA | Case series | English | 1.21~4.17 | 46 | 26~34 | 37+3/7~39 +6/7 |
Yes |
| London et al. (79) | May 19, 2020 | USA | Cohort study | English | 3.15~4.15 | 68 | 24~34 | Not reported | No |
| Li et al. (80) | May 19, 2020 | China | Case report | English | 2.06~2.19 | 1 | 30 | 35 | No |
| Qadri et al. (81) | May 20, 2020 | USA | Case series | English | Not mention | 16 | 20~40 | 22~40+3/7 | No |
| Tang et al. (82) | May 23, 2020 | Netherlands | Case report | English | 4.01~4.30 | 1 | Not reported | 41 | No |
| Lowe et al. (83) | May 28, 2020 | Australia | Case report | English | Not mention | 1 | 31 | 40+3/7 | No |
| Kayem et al. (84) | Jun. 4, 2020 | France | Case series | English | 3.01~4.14 | 617 | Not reported | Not reported | No |
| Martínez-Perez et al. (85) | Jun. 8, 2020 | Spain | Cohort study | English | 3.12~4.06 | 82 | 19~48 | 25~41+4/7 | Yes |
| Wang et al. (86) | Jun. 8, 2020 | China | Case series | English | 12.08~4.01 | 30 | 26~33 | 30~40+6/7 | No |
| Knight et al. (87) | Jun. 8, 2020 | UK | Cohort study | English | 3.01~4.14 | 427 | Not reported | Not reported | Yes |
| Pereira et al. (88) | Jun. 10, 2020 | Spain | Case series | English | 3.14~4.14 | 60 | 22~43 | 27~41 | No |
| Bani Hani et al. (89) | Jun. 12, 2020 | Jordan | Case report | English | 3.28~4.12 | 1 | 29 | 37+4/7 | No |