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Table 2 Geometric mean blood volume cultured in relation to isolate recovery for 760 blood cultures assessed during the two surveillance periods in 2003 and 2005

From: Blood culture collection technique and pneumococcal surveillance in Malawi during the four year period 2003–2006: an observational study

  N Mean volume ml 95% CI OR (95%CI) ORa (95%CI)
No growth 566 5.51 5.28–5.75   
Contaminants 52 3.76 3.17–4.45   
S. pneumoniae 31 6.71 5.69–7.93 1.18 (1.05–1.33) 1.29 (1.08–1.53)
Non typhi Salmonella 70 5.21 4.61–5.87 0.99 (0.90–1.07) 0.97 (0.86–1.09)
Cryptococcus neoformans 4 6.72 2.45–18.45 1.19 (0.86–1.65) 0.86 (0.61–1.20)
Other Gram negative 27 3.04 1.99–4.65   
Other Gram positive 10 3.70 2.63–5.20   
  1. For clarity, Gram negative and Gram positive bacteria other than S. pneumoniae and the non-typhi Salmonella have been grouped together. Odds Ratios are presented unadjusted (OR) and adjusted (ORa) for year of sampling and represent the chances of recovering an isolate with each extra ml of blood over the range of volumes taken in this study 1–13 mls.