Skip to main content
. 2008 May 22;52(5):405–412. doi: 10.1093/annhyg/men021

Table 2.

Analysis of variance: effects of stages of fattening and density of birds on the values of bioaerosols concentrations, estimated by Q-PCR method, in 12 Swiss poultry houses

Source of variation d.f. Mean sum of square F-ratio P
Response: airborne endotoxin, R2 = 0.592
    Stages 2 8.882 20.164 <0.001
    Density 1 0.018 0.041 0.840
    Stage × density 2 0.043 0.097 0.907
    Residuals 30 0.44
Response: airborne Staphylococcus species, R2 = 0.676
    Stages 2 123.332 23.106 <0.001
    Density 1 18.614 3.487 0.072
    Stage × density 2 0.869 0.163 0.851
    Residuals 29 5.338
Response: total airborne bacteria species, R2 = 0.830
    Stages 2 33.208 62.734 <0.001
    Density 1 0.146 0.276 0.603
    Stage × density 2 0.524 0.989 0.384
    Residuals 30 0.529
Response: inhalable dust, R2 = 0.792
    Stages 2 20.416 39.972 <0.001
    Density 1 0.007 0.013 0.910
    Stage × density 2 0.133 0.261 0.773
    Residuals 24 0.511

R2 = percentage of variance explained by the model. Geometric mean values of each stage for each bioaerosol are presented in the Figs 1– 4. Significance was set at P < 0.05.