Table 1.

Studies reporting preterm deliveries (as of 10/4/2020)

Parameters	Findings
Study	Chen et al 2	Zhu et al 3	Liu et al 4	Zeng et al 5	Zhang et al 6	Chen et al 7	Liu et al 8	Li et al 9
Study period	20.1.20‐31.1.20	20.1.20‐5.2.20	8.12.19‐5.2.20	Jan‐Feb	30.01.20‐17.02.20	30.01.20‐23.2.20	20.1.20‐ 10.2.20	24.1.20‐ 29.2.20
Confirmed SARS‐CoV‐2+ pregnant women	9	9	13	33	16	17	15	16
Time point of symptom presentation
1st trimester	0	0	0	NR	0	NR	1	0
2nd trimester	0	0	2	NR	0	NR	2	0
3rd trimester (before birth)	9	6	11	NR	16	NR	12	4
After delivery	0	3	0	NR	0	NR	0	8
Maternal morbidity with COVID‐19
Asymptomatic	0	0	1	NR	NR	9	2	4
Symptomatic	9	9	11	NR	NR	8	13	12
Severe	0	0	1	NR	1	0	0	0
Total number that delivered	9	9	13	33	16	17	11	16
Cesarean delivery	9	7	5	26	16	17	10	14
Pregnancy outcome
Miscarriage	0	0	1	0	0	0	0	0
Preterm delivery	4	5	6	4	1	3	3	4
Term delivery	5	4	6	29	15	14	8	12
Recovered without delivering	0	0	0	0	0	0	NR	0
Maternal mortality	0	0	0	0	0	0	0	0
Number of neonates included in study	9	10	13	33	10	17	11	17
Neonatal adverse outcome
Pneumonia	0	4	NR	3	3 (bacterial)	0	NR	NR
Low birthweight	2	6	NR	NR	NR	0	NR	3
SGA	NR	2	NR	3	NR	NR	NR	NR
NRDS	0	2	NR	4	0	0	NR	0
Preterm neonatal adverse outcome
Pneumonia	0	2/6	NR	1/4	NR	0	NR	NR
Low birthweight	2/4	6/6	NR	NR	NR	0/3	NR	NR
SGA	NR	0	NR	NR	NR	NR	NR	NR
NRDS	0	0	NR	NR	NR	0	NR	NR
Neonatal death	0	1/6	1/6	0	0	0	0	0
Confirmed SARS‐CoV‐2+ neonates	0	0	0	3	0	0	NR	0
Vertical transmission reported	0	a	0	a	0	0	NR	0
Horizontal transmission reported	0	0	0	3	0	0	NR	0
Symptomatic	0	0	0	3	0	0	NR	0
Newborn mortality	0	1/10	1/13	0	0	0	0	0

Abbreviations: COVID, coronavirus disease; NR, not reported; NRDS, neonatal respiratory distress syndrome; SARS‐CoV‐2, severe acute respiratory syndrome‐coronavirus 2; SGA, small for gestational age.

^aVertical transmission not ruled out.