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Table 3 Frequencies of MRSA, MSSA, and Total SA colonization at Week 4 by GI and extra-GI body site, stratified by site of original colonization, and randomized treatment group

From: Effect of Lactobacillus rhamnosus HN001 on carriage of Staphylococcus aureus: results of the impact of probiotics for reducing infections in veterans (IMPROVE) study

Initial Colonization Site: Extra-GI (N = 50) GI (N = 63) Cochran-Mantel-Haenszel
Final Colonization Site Organism Probiotic (N = 18) n (%) Placebo (N = 32) n (%) P-value Probiotic (N = 34) n (%) Placebo (N = 29) n (%) P-value Odds Ratio 95% Confidence Interval
GI MRSA 1 (5.6) 2 (6.3) 1.0000 5 (14.7) 4 (13.8) 1.0000 1.00 0.29–3.43
MSSA 9 (50.0) 16 (50.0) 0.8368 23 (67.7) 21 (72.4) 0.9105 0.78 0.34–1.83
SA Total 9 (50.0) 17 (53.1) 0.7588 25 (73.5) 24 (82.8) 0.7574 0.62 0.26–1.52
Extra-GI MRSA 3 (16.7) 3 (9.4) 0.4485 5 (14.7) 4 (13.8) 1.0000 1.30 0.43–3.90
MSSA 15 (83.3) 19 (59.4) 0.1332 16 (47.1) 16 (55.2) 0.8635 1.11 0.49–2.53
SA Total 16 (88.9) 22 (68.8) 0.2728 20 (58.8) 19 (65.5) 0.6134 1.08 0.46–2.52
  1. Abbreviations: MRSA methicillin-resistant Staphylococcus aureus, MSSA methicillin susceptible Staphylococcus aureus, SA Staphylococcus aureus, GI gastrointestinal