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Table 4 Summary of studies reporting incidence of influenza-associated hospital 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 14 3,392,060 0.04 per 10,000 pregnancies (0.02–0.07) Pandemic Case series JBI = 6/7 Both 1 month US
Creanga 2010 63 113,877 5.5 per 10,000 pregnancies (4.25–7.08) Pandemic Case series JBI = 6/7 Hospital 2 months US
Yates 2010 241 314,135 7.7 per 10,000 pregnancies (6.7–8.7) Pandemic Case series NOS = 9 Hospital 5 months UK
Doyle 2013 170 295,941 5.7 per 10,000 pregnanciesa (4.94–6.68) Pandemic Case series NOS = 8 Both 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