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Table 6 Summary of studies reporting incidence of influenza-associated deaths

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? Inclusion criteria Duration of surveillance (months or years) Country
Jamieson 2009 1 3,392,060 0.003 per 10,000 pregnanciesa (0.000–0.021) Pandemic Case series JBI = 6/7 Both Pregnant women with laboratory-confirmed (PCR or culture) H1N1 1 month US
Creanga 2010 2 113,877 0.18 per 10,000 pregnancies (0.04–0.70) Pandemic Case series JBI = 6/7 Hospital Reproductive-aged women with rtPCR-confirmed H1N1 hospitalized in NYC 2 months US
Knight 2011 6
4
86,449
193,796
0.69 per 10,000 pregnancies
0.21 per 10,000 pregnanciesb
(0.26–1.51)
(0.06–0.53)
Pandemic Case series JBI = 6/7 Hospital Confirmed AH1N1v infection during pregnancy and subsequently admitted to ICU 5 months
3 months
Australia/New Zealand
UK
Doyle 2013 8 295,941 0.27 per 10,000 pregnanciesa (0.14–0.54) Pandemic Case series NOS = 8 Both Acute respiratory illness, with laboratory
confirmation of pH1N1 by a certified laboratory
13 months US
  1. aCalculated from provided number of cases or %
  2. b NOS Newcastle-Ottawa Scale, JBI JBI Critical Appraisal Checklist for Descriptive/Case Series