Table 1.
Descriptive characteristics of categorical variables in a study that investigated factors associated with the presence of S. enterica and the concentration of E. coli in samples collected from the floor(s) of commercial broiler chicken barns in Ontario during the rest period.
| Variable | Category | No. of observations |
|---|---|---|
| Sanitation procedure (n = 696)1 | Dry cleaning | 312 |
| Wet cleaning | 48 | |
| Disinfection | 336 | |
| Sampling point (n = 696) | Baseline | 232 |
| 2 d after sanitation | 232 | |
| 6 d after sanitation | 232 | |
| Flooring type (n = 696) | Concrete | 432 |
| Wood | 264 | |
| Season (n = 696)2 | Fall | 216 |
| Winter | 276 | |
| Spring | 48 | |
| Summer | 156 | |
| Floor number within barn (n = 696)3 | Bottom | 432 |
| Middle | 240 | |
| Top | 24 | |
| Total number of stories (n = 696) | One | 192 |
| Two | 432 | |
| Three | 72 | |
| Personnel entered barn after sanitation was completed (n = 696) | No | 96 |
| Yes | 600 | |
| Method of dry cleaning (n = 696) | Blower only | 420 |
| Blow and sweep | 240 | |
| Did not dry-clean | 36 | |
| Who completed dry cleaning (n = 696) | Producer | 492 |
| Farm employee | 168 | |
| Did not dry-clean | 36 | |
| Product used for wet cleaning (n = 384) | Water | 216 |
| Biosolve Plus4 | 12 | |
| Basic H5 | 24 | |
| Did not wet-clean before disinfection | 132 | |
| Method of wet cleaning (n = 384) | Spray | 216 |
| Not specified | 36 | |
| Did not wet-clean before disinfection | 132 | |
| Temperature of water for wet cleaning (n = 384) | Cold | 36 |
| Warm or hot | 216 | |
| Did not wet-clean before disinfection | 132 | |
| Pressure washer used for wet cleaning (n = 384) | No | 12 |
| Yes | 240 | |
| Did not wet-clean before disinfection | 132 | |
| Who completed the wet cleaning (n = 384) | Producer | 156 |
| Farm employee | 48 | |
| Contracted company | 48 | |
| Did not wet-clean before disinfection | 132 | |
| Product used for disinfection (n = 336) | QAC | 24 |
| Aldehyde | 48 | |
| Phenol | 12 | |
| Chlorine | 48 | |
| Peroxygen | 120 | |
| QAC/Aldehyde | 84 | |
| Method of disinfection (n = 336) | Spray | 180 |
| Foam | 60 | |
| Fog | 96 | |
| Temperature of disinfection (n = 336) | Cold | 132 |
| Warm or hot | 108 | |
| Not relevant to method | 96 | |
| Pressure washer used for disinfection (n = 336) | No | 48 |
| Yes | 192 | |
| Not relevant to method | 96 | |
| Who completed disinfection (n = 336) | Producer | 180 |
| Farm employee | 72 | |
| Contracted company | 84 | |
| Was the wet cleaning and disinfection done back-to-back (i.e., without allowing time for the surfaces to dry before applying the disinfectant) (n = 336) | No | 84 |
| Yes | 144 | |
| Did not wet-clean before disinfection | 108 | |
| Sanitation procedure used with previous flock (n = 696) | Dry clean only | 240 |
| Wet clean | 96 | |
| Disinfection | 360 | |
| No. of times per yr the barn is wet-cleaned (n = 696) | 0 | 240 |
| 1 | 324 | |
| 2 | 60 | |
| 3 | 24 | |
| 4 | 0 | |
| 5 | 24 | |
| 6 | 24 | |
| No. of times per yr the barn is disinfected (n = 696) | 0 | 120 |
| 1 | 120 | |
| 2 | 108 | |
| 3 | 48 | |
| 4 | 12 | |
| 5 | 48 | |
| 6 | 240 | |
| Cycle length (n = 696) | 8 wk | 228 |
| 9 wk | 300 | |
| 10 wk | 168 |
QAC, quaternary ammonium compound.
Dry cleaning: dry cleaning only; wet cleaning: dry cleaning followed by wet cleaning; disinfection: dry cleaning followed by wet cleaning followed by disinfection.
Fall: September 21st to December 20th; winter: December 21st to March 20th; spring: March 21st to June 20th; summer: June 21st to September 20th.
Variable created to determine if the location of the floor within the barn had a significant impact.
Biosolve Plus is an alkaline cleaner and degreaser sold by Vétoquinol.
Basic H is an organic cleaner sold by Shaklee.