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Table 1 Mean values of CFU/m 3 air during four operations in operating room 1 when all persons present were dressed in a surgical clothing system of mixed material (69% cotton, 30% polyester, 1% carbon fibre) which was either washed repeatedly or brand new

From: Comparison of three distinct surgical clothing systems for protection from air-borne bacteria: A prospective observational study

Type of surgery Clothing Number of persons present CFU/m3 air mean (min-max)
Hip fracture Mixed material, washed 7 38.3 (17–55)
Hip fracture Mixed material, washed 8 20.2 (9–32)
Lower leg fracture Mixed material, brand new 7 16.7 (13–24)
Lower leg fracture Mixed material, brand new 7 31.8 (8–50)