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Table 5 Summary of studies reporting incidence of influenza-associated ICU admission

From: Incidence of influenza virus infection among pregnant women: a systematic review

Study Number of cases Denominator Crude incidence rate (CI) 95% CI Pandemic or seasonal? Study design Grading system and scoreb Hospital-based or clinic-based? Duration of surveillance (months or years) Country
Jamieson 2009 3 3,392,060 0.01 per 10,000 pregnanciesa (0.00–0.03) Pandemic Case series JBI = 6/7 Both 1 month US
Creanga 2010 8 113,877 0.70 per 10,000 pregnancies (0.30–1.38) Pandemic Case series JBI = 6/7 Hospital 2 months US
Doyle 2013 9 295,941 0.30 per 10,000 pregnanciesa (0.16–0.58) Pandemic Case series NOS = 8 Both 13 months US
Knight 2011 59 86,449 6.8 per 10,000
pregnancies
(5.2–8.8) Pandemic Case series JBI = 6/7 Hospital 3 months Australia/New Zealand
57 332,569 1.7 per 10,000
pregnancies
(1.3–2.2)      5 months UK
Peak: 51 193,796 2.6 per 10,000 pregnancies (2.0–3.5)      3 months UK
  1. aCalculated from provided number of cases or %
  2. b NOS Newcastle-Ottawa Scale, JBI JBI Critical Appraisal Checklist for Descriptive/Case Series, Cochrane The Cochrane Collaboration’s tool for assessing risk of bias in randomised trials