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

15.8

19.2

1.21 (0.70–2.10)

0.473

1.25 (0.70–2.13)

30.0

1.89 (1.15–3.11)

0.011

1.90 (1.16–3.11)

35.8

2.26 (1.40–3.65)

0.001

2.28 (1.38–3.58)

47.5

3.00 (1.91–4.72)

< 0.001

2.95 (1.88–4.64)

40.0

2.53 (1.51–4.23)

0.001

3.37 (2.14–5.21)

45.0

2.84 (1.80–4.49)

< 0.001

2.44 (1.45–4.08)

52.5

3.32 (2.12–5.18)

< 0.001

2.78 (1.76–4.39)

71.7

4.53 (2.91–7.04)

< 0.001

4.38 (2.82–6.80)

40.7

35.1

0.86 (0.73–1.01)

0.241

0.91 (0.78–1.06)

29.4

47.5

1.62 (1.28–2.05)

< 0.001

1.57 (1.27–1.93)

40.6

1.39 (1.08–1.78)

0.008

1.37 (1.09–1.72)

38.4

1.30 (1.05–1.62)

0.014

1.30 (1.05–1.60)