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Table 2 Effects of digest, time, surface, and axial location on OTU richness in urinary catheters

From: Early development of bacterial community diversity in emergently placed urinary catheters

  ndf ddf F P
Fixed effects
Digest 1 100 5.92 0.0168*
Duration 1 6 1.31 0.2959
Surface 1 100 0.43 0.5119
Axial location 1 100 1.70 0.1949
Surface × duration 1 100 5.41 0.0220*
Surface × axial location 1 100 2.41 0.1234
   df LR statistic P
Random effects
Subject, intercept   0, 1 16.7 <0.0001***
  1. Axial location was modeled as a continuous variable (1, 2, 3, 4 for males and 1, 2.5, 4 for females). The significance of random effect (subject) and the proper covariance structure for the repeated measures were tested using likelihood ratio tests. Ndf is numerator degrees of freedom, ddf is denominator degrees of freedom. Urinary catheters from 5 males and 3 females catheterized in a level 1 trauma center for 1 to 16 days.
  2. *** is p <0.001, *p <0.05.