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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