TABLE 3.

Effect of soap volume on the reduction of Serratia marcescens on the hands

TestSoap volTreatment (no. of subjects)Log10 count/hand (95% CI)
No. of pumpsWt (g)BaselineaSingle-wash reduction
111.5Antimicrobial (12)6.32 (6.10-6.54)3.15 (2.78-3.52)b,c
0.75Nonantimicrobial (12)6.34 (6.20-6.48)0.25 (0.19-0.31)b
223Antimicrobial (10)6.24 (6.01-6.47)3.83 (3.58-4.08)b,c,d
1.5Nonantimicrobial (9)6.25 (5.94-6.56)0.88 (0.61-1.15)b,e
343Nonantimicrobial (10)6.13 (5.97-6.29)1.08 (0.75-1.41)d,e
  • a P > 0.5 (ANOVA; antimicrobial baseline versus nonantimicrobial baseline within each test).

  • b P < 0.001 (ANOVA; antimicrobial wash versus plain-soap wash within each test).

  • c P < 0.001 (ANOVA; antimicrobial soap; test 1 versus test 2).

  • d P < 0.001 (ANOVA; antimicrobial soap test 2 versus nonantimicrobial soap test 3).

  • e P = 0.19 (ANOVA nonantimicrobial soap; test 2 versus test 3).