Then, the split among industry categories, within each cluster, was calculated according to the overall proportion of establishments for each industry category in the case study.
In addition, the proportion of establishments with >4 positive broiler rinses per year (of 51 broiler rinse tests per set) increased, beginning in 2002.
US Department of Agriculture Food Safety and Inspection Service FSISS) data on Salmonella enterica serotype Enteritidis in broiler chicken carcass rinses collected from 2000 through 2005 showed the annual number of isolates increased >4-fold and the proportion of establishments with Salmonella Enteritidis positive rinses increased nearly 3-fold (test for trend, p<0.0001).
Additional file 1: Table S5 shows that significantly different proportion of establishment of localization, primary metabolic process, glycoside hydrolases, secondary metabolites, response to stress genes were present in P. lilacinum as compared to P. chlamydosporia, with abundance of serine proteases in P. lilacinum.
While most establishments with Salmonella Enteritidis positive broiler rinses were large, in most years, a higher proportion of the small establishments that were tested had positive rinses.
During the 6-year study period, the proportion of Salmonella Enteritidis positive establishments with multiple positive broiler rinses per year also increased significantly (p<0.01, test for trend, Figure 1).
The OLS analysis ignores the fact that a large proportion of the between-establishment variation lies between the different intervention cities. Intra-class correlation measures the proportion of the variance in the outcome that is between groups.
There was a significant reduction in the percentage of plant establishment with increasing soil salinity according to the following expression: Y = 107.270 − 2.561 X (Radj = 0.907, P < 0.001), where Y is arcsine (degrees) of proportion of cumulative plant establishment and X is salt concentration.
Clustering was based on the proportion of food establishments because the number of establishments will drive the clusters (i.e., most of the areas with overall high number of establishments will be in clusters together, regardless of the composition of the area), and proportion does provide information about food establishment options available to people in a geographic area.
Proportions of each establishment type were calculated from the total list of establishments, which were used to determine the proportion of the total sample of FSWs to select from each establishment type.
During the study period, increases were seen in the proportion of both large and small establishments that had such positive broiler rinses.
