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Table 1 Medians (minimum value; maximum value) referring to Phases I, II and III of the samples obtained from the surfaces

From: Evaluation of disinfection of surfaces at an outpatient unit before and after an intervention program

Phase I (no intervention)

 Analysis method

Cleaning

Reception desk

p value

Bandage trolley

p value

Stretcher

p value

Operating table

p value

Mayo table

p value

 ATP (RLU)1

Before

209 (71;1365)

0.834

124 (60;299)

0.107

304 (156;1452)

0.624

564 (150;2417)

0.030

324.5 (120;735)

0.014

After

203 (34;575)

69 (13;338)

189 (58;2083)

207 (33;1415)

42.5 (11;62)

 Bacteria (CFU/cm2)1

Before

96 (53;219)

0.183

40.5 (4;96)

0.107

78.5 (61;197)

0.441

113.5 (37;300)

0.021

87.5 (64;154)

0.624

After

63.5 (31;153)

45.5 (37;94)

53 (6;176)

66.5 (2;112)

50.5 (3;172)

 Variation analysis2

RLU

−2.3 (−91.8;349.2)

0.563

−49.5 (−85.3;52.3)

0.018

−19 (−94.9;410.5)

0.713

−60.8 (− 93.5;19.8)

0.494

−89 (− 93.6;-76.9)

0.031

CFU

−31.3 (−71.2;88.9)

71 (−39;825)

−32 (−96.8;100)

−26.5 (−99.2;10.6)

−44 (−96.4;100)

Phase II (short-term evaluation)

 ATP (RLU)1

Before

239 (96;958)

0.183

114 (70;533)

0.014

295 (59;886)

0.014

166 (50;1515)

0.021

194.5 (41;256)

0.014

After

61.5 (40;326)

36.5 (17;95)

41.5 (25;483)

44.5 (11;90)

44.5 (17;83)

 Bacteria (CFU/cm2)1

Before

31.5 (7;300)

0.042

58 (6;300)

0.014

47 (6;257)

0.183

17.5 (2;62)

0.014

59.5 (26;173)

0.014

After

11.5 (2;18)

6 (0;30)

5 (0;28)

2 (0;17)

2.5 (0;31)

 Variation analysis2

RLU

−72 (−86;193.7)

0.792

−72.4 (−90.8;-56.6)

0.083

− 67.6 (−93.8;-36.5)

0.189

−69.5 (−97.7;1.6)

0.462

−71.9 (−87.9;-8.1)

0.010

CFU

−65.1 (−99.3;57.1)

−87.0 (−100;-16.7)

−92.3 (−100;283.3)

−76.3 (−100;-50)

−93.8 (− 100;-50.8)

Phase III (after intervention – long-term evaluation)

 ATP (RLU)1

Before

633 (109;1327)

0.014

237.5 (53;530)

0.014

451 (113;3809)

0.014

1053 (140;9597)

0.014

109 (23;1989)

0.183

After

123.5 (16;792)

41.5 (15;94)

56.5 (22;166)

95 (59;610)

46.5 (17;91)

 Bacteria (CFU/cm2)1

Before

72.5 (9;294)

0.234

32.5 (11;251)

0.183

45 (3;179)

0.141

15 (3;252)

0.353

13.5 (0;39)

0.036

After

14.5 (3;60)

4.5 (2;39)

4 (0;6)

2.5 (0;178)

1 (0;14)

 Variation analysis2

RLU

−78.4 (−95.6;-12.7)

0.833

−82.4 (−93;-30.2)

0.713

−87.1 (−95.6;-58.4)

0.636

−85 (−99.4;-34.3)

0.713

−52.1 (−99.1;78.3)

0.271

CFU

− 84.2 (−96.3;122.2)

−88.5 (− 99.2;105.3)

−89.2 (−100;100)

−72 (−100;1680)

−94.9 (−100;0)

  1. Note: CFU colony-forming unit, ATP adenosine triphosphate, RLU relative light unit. 1p value referring to the Wilcoxon rank-sum test with p < 0.05. 2p value referring to the Mann-Whitney test with p < 0.05
  2. Values captured in bold are statistically significant