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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