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 |