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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