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Table 8 Predicted probability of pregnancy outcomes during admission according to influenza infection status

From: Epidemiology of influenza in pregnant women hospitalized with respiratory illness in Moscow, 2012/2013–2015/2016: a hospital-based active surveillance study

Outcome

RT-PCR result

Adjusted predicted probability a (95% CI)

n

Abortion (<  20 weeks)

No influenza

0.07 (0.05, 0.09)

39

 

A(H1N1)pdm09

0.03 (0.01, 0.06)

8

 

A(H3N2)

0.02 (0.00, 0.05)

3

 

B/Yamagata-lineage

0.03 (−0.01, 0.06)

2

Stillbirth (≥ 20 weeks)

No influenza

0.02 (0.01, 0.03)

11

 

A(H1N1)pdm09

0.01 (0.00, 0.02)

2

 

A(H3N2)

0.02 (0.00, 0.05)

3

 

B/Yamagata-lineage

0.06 (0.00, 0.12)

4

 

B/Victoria-lineage

0.03 (−0.01, 0.07)

2

Live delivery during admission

No influenza

0.11 (0.09, 0.13)

99

 

A(H1N1)pdm09

0.09 (0.06, 0.12)

31

 

A(H3N2)

0.09 (0.05, 0.12)

24

 

B/Yamagata-lineage

0.11 (0.06, 0.16)

14

 

B/Victoria-lineage

0.08 (0.01, 0.15)

4

Preterm (< 37 weeks gestational age)

No influenza

0.13 (0.07, 0.20)

19

 

A(H1N1)pdm09

0.27 (0.06, 0.48)

9

 

A(H3N2)

0.19 (0.01, 0.38)

4

 

B/Yamagata-lineage

0.06 (−0.05, 0.17)

1

 

B/Victoria-lineage

0.54 (− 0.05, 1.13)

2

Cesarean delivery

No influenza

0.18 (0.09, 0.26)

16

 

A(H1N1)pdm09

0.09 (−0.02, 0.21)

3

 

A(H3N2)

0.29 (0.09, 0.49)

6

 

B/Yamagata-lineage

0.15 (−0.05, 0.36)

2

Low birth weight (<  2500 g)

No influenza

0.14 (0.07, 0.21)

12

 

A(H1N1)pdm09

0.05 (−0.06, 0.16)

1

 

A(H3N2)

0.06 (−0.06, 0.17)

1

 

B/Victoria-lineage

0.55 (−0.05, 1.15)

1

  1. Abbreviation: RT-PCR reverse transcription-polymerase chain reaction
  2. aAdjusted by age, smoking habits, chronic underlying conditions, admission in last 12 months, trimester, time to swab and season-week