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Table 4 Univariate and multivariate analysis per group with display of percentages of “not clean” (RLU > 1000) items. In the multivariate analysis, the model was adjusted for medical specialty and surface category

From: ATP measurement as an objective method to measure environmental contamination in 9 hospitals in the Dutch/Belgian border area

  UnivariateMultivariate
 > 1000 RLU (%)PRR (95% BI)PRR (95% BI)
hospital
 hospital 115.8Ref   
 hospital 219.20.4981.21 (0.70–2.10)0.4731.25 (0.70–2.13)
 hospital 330.00.0111.89 (1.15–3.11)0.0111.90 (1.16–3.11)
 hospital 435.80.0012.26 (1.40–3.65)0.0012.28 (1.38–3.58)
 hospital 547.5< 0.0013.00 (1.91–4.72)< 0.0012.95 (1.88–4.64)
 hospital 640.0< 0.0012.53 (1.51–4.23)0.0013.37 (2.14–5.21)
 hospital 745.0< 0.0012.84 (1.80–4.49)< 0.0012.44 (1.45–4.08)
 hospital 852.5< 0.0013.32 (2.12–5.18)< 0.0012.78 (1.76–4.39)
 hospital 971.7< 0.0014.53 (2.91–7.04)< 0.0014.38 (2.82–6.80)
medical specialty
 surgical40.7Ref   
 non-surgical35.10.0760.86 (0.73–1.01)0.2410.91 (0.78–1.06)
surface category
 sanitary items29.4Ref   
 Patient bound materials47.5< 0.0011.62 (1.28–2.05)< 0.0011.57 (1.27–1.93)
 ward bound materials40.60.0101.39 (1.08–1.78)0.0081.37 (1.09–1.72)
 medical devices38.40.0161.30 (1.05–1.62)0.0141.30 (1.05–1.60)
  1. Significant differences in bold (p < 0.05)