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Table 1 Maternal characteristics of symptomatic and asymptomatic COVID-19 patients

From: Clinical characteristics of pregnant women with COVID-19 in Japan: a nationwide questionnaire survey

  Symptomatic patients (n = 58) Asymptomatic patients (n = 14) P-value
Maternal age
 Median (interquartile range) 31 (27–36) 32 (25–33) 0.41
 Under 20 0 (0%) 0 (0%)  > 0.99
 20–29 20 (34.5%) 6 (42.9%) 0.56
 30–39 33 (56.9%) 8 (57.1%) 0.99
 over 40 5 (8.6%) 0 (0%) 0.58
Approach for diagnosis
 Symptom 57 (98.3%) 0 (0%)  < 0.001
 Contact with confirmed or suspected patients 1 (1.7%) 12 (85.7%)  < 0.001
 Universal screening 0 (0%) 2 (14.3%) 0.04
Pregnancy period at diagnosis
 1st trimester 12 (20.7%) 3 (21.4%)  > 0.99
 2nd trimester 28 (48.3%) 4 (28.6%) 0.18
 3rd trimester 15 (25.9%) 5 (35.7%) 0.51
 Postpartum 3 (5.2%) 2 (14.3%) 0.25
Epidemiological history
 Familial infection 33 (56.9%) 8 (57.1%) 0.99
 Community-acquired 5 (8.6%) 3 (21.4%) 0.18
 Visiting and staying in infected areas 4 (6.9%) 0 (0%) 0.58
 Nosocomial infection 2 (3.4%) 1 (7.1%) 0.48
 Workplace infection 1 (1.7%) 2 (14.3%) 0.10
 Unknown 13 (22.4%) 0 (0%) 0.06
Comorbidities
 Gestational diabetes 5 (8.6%) 0 (0%) 0.58
 Preeclampsia 1 (1.7%) 0 (0%)  > 0.99
 Asthma 3 (5.2%) 0 (0%)  > 0.99
Course of pregnancya
 Pregnancy ongoing 29 (50.0%) 7 (50.0%)  > 0.99
 Delivery 21 (36.2%) 5 (35.7%) 0.97
 Delivery during infection 9 (15.5%) 3 (21.4%) 0.69
 Spontaneous abortion 2 (3.4%) 0 (0%)  > 0.99
 Induced abortion 1 (1.7%) 0 (0%)  > 0.99
Prognosis of mother
 Recovered without subsequent complication 57 (98.3%) 14 (100%)  > 0.99
 Death 1 (1.7%) 0 (0%)  > 0.99
  1. Data indicate n (%)
  2. a Excluding 1 maternal death, 1 case of missing data, and 5 cases of puerperium diagnosis