Skip to main content

Table 1 Selected design characteristics of studies included in an analysis of the relation between asthma and IPD

From: Association between asthma and invasive pneumococcal disease risk: a systematic review and meta-analysis

Study Study design Country Sample size Population age IPD definition
Talbot TR et al. (2005) Case–control USA 6985 2–49 years Isolation of S. pneumoniae from a normally sterile site
James P. Watt et al. (2007) Case–control USA 471  > 18 years Isolation of S. pneumoniae from a normally sterile site
Hjuler T et al. (2008) Case–control Denmark 17,028 0–17 years Isolation of S. pneumoniae from a normally sterile site
Juhn YJ et al. (2008) Case–control USA 522 2–64 years Isolation of S. pneumoniae from a normally sterile site or pneumococcal pneumonia requiring all three criteria
K. H. Yoo et al. (2009) Case–control USA 438 All ages Isolation of S. pneumoniae from normally sterile body fluids
Klemets P et al. (2010) Case–control Finland 14,067 18–49 years S. pneumoniae was isolated from blood and/or CSF
Pilishvili T et al. (2010) Case–control USA 3294 3–59 months Isolation of Pneumococcus from a normally sterile site or a surveillance area resident
Inghammar M et al. (2013) Case–control Sweden 44,438  > 18 years Isolation of S. pneumoniae from normally sterile body fluids