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Table 1 Effect of environmental factors on dissimilarity in genus composition of paired classrooms using permutational multivariate analysis of variance (PERMANOVA) models

From: Bacterial community assemblages in classroom floor dust of 50 public schools in a large city: characterization using 16S rRNA sequences and associations with environmental factors

Environmental variable Mean (SD)* Full model (all categorical)** Reduced model 1 (all categorical)** Reduced model 2 (all categorical)**
R2 P value R2 P value R2 P value
Water damage score 0.17 (0.13) 0.01 < 0.001    0.01 < 0.001
Relative humidity 50.4 (9.9) 0.01 0.04 0.01 0.03 0.01 0.02
Temperature 81.1 (5.8) 0.01 < 0.001 0.01 < 0.001 0.02 < 0.001
Number of students 21.1 (9.3) 0.01 0.02 0.01 0.01 0.01 0.01
FCI score 38.8 (17.9) 0.02 < 0.001 0.02 < 0.001 0.02 < 0.001
Area   0.02 < 0.001 0.02 < 0.001   
Floor material type   0.01 < 0.01 0.01 < 0.01 0.01 <0.01
Story in a building   0.01 < 0.001 0.01 < 0.001 0.01 < 0.001
Model residuals   0.89   0.90   0.91  
  1. *Mean and standard deviation (SD) for the numerical variables
  2. **All environmental variables in these models were categorical. Area: north (n = 159), northeast (90), southeast (90), southwest (160); type of floor material: carpet (13), tile (208), wood (223), others (55); story in a building: 1st (165), 2nd (171), 3rd, or higher (143), ground or lower (20). Continuous variable was categorized into four levels based on quartile to create a categorical variable
  3. FCI facility condition assessment index