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Table 1 The results of culture report times and ATP test for E. coli (ATCC 25922) cultured by reference or C&W methods

From: Repeated centrifuging and washing concentrates bacterial samples in peritoneal dialysis for optimal culture: an original article

  Reference C&W p-value
Gram stain report time (minutes) 238 ± 65 40 ± 0 < 0.001
Colony count*(×104 CFU/ml) 5.6 (3.8–6.9) 10 (8.7–10) 0.015
ATP generation test (RLU#) 27.6 ± 3.6 49.1 ± 6.6 < 0.001
  1. C&W centrifuging and washing method, # RLU relative light unit
  2. * colony count > 105 CFU/ml was counted as 105 CFU/ml