Table 1 Description of outcome- and explanatory variables, at a municipality level
Variables | Description | Unit (per municipality) |
|---|---|---|
Human | ||
Number of cases notified per total person years | Number of human psittacosis infections notified from 01-01-2000 until 01-09-2015 weighted against the total person years based on the reference year 2012 (population in 2012 times 14 years). | Number of cases / total person years |
Animal | ||
Total poultry density | The density of all poultry combined. | Birds/km2 |
Total poultry farm density | The number of poultry farms per km2 times factor 100. | Number of farms*100/km2 |
Average poultry farm size | Average size of a poultry farm. | Birds |
Chicken processing plant presence | The presence of a chicken processing plant. | Yes/no |
Chicken presence | The presence of chickens (both broilers and layers). | Yes/no |
Turkey presence | The presence of turkeys. | Yes/no |
Slaughter duck presence | The presence of slaughter ducks. | Yes/no |
Total broiler presence | The presence of broilers (including parents of broilers) | Yes/no |
Total layer presence | The presence of layers (including parents of layers). | Yes/no |
Outdoor range layer presence | The presence of places for layers with outdoor range. | Yes/no |