Table 1.
Summary Statistics for Daily Cattle Mortality, Weather Conditions and Air Pollution Levels and for the Absolute Differences between the Daily Levels of Each Pollutant (Case Days) and the Average Concentrations over the Control Days, Belgium 2006-2009.
| Warm Season (N=39,979) |
Cold Season (N=47,129) |
||||||||
|---|---|---|---|---|---|---|---|---|---|
| Variable | Mean | SD | Min | Max | Mean | SD | Min | Max | |
| Daily Number of Cow Deaths | |||||||||
| 55 | 22 | 12 | 145 | 65 | 26 | 0 | 162 | ||
| Exposure on Case Days | |||||||||
| O3 (µg/m3) | 81 | 26 | 16 | 222 | 48 | 20 | 2.4 | 115 | |
| PM10 (µg/m3) | 25 | 12 | 2.6 | 95 | 27 | 17 | 1.3 | 142 | |
| NO2 (µg/m3) | 15 | 7.8 | 1.0 | 60 | 21 | 11 | 1.0 | 93 | |
| Temperature (°C) | 16 | 4.2 | 4.1 | 29 | 6.2 | 4.4 | -8.2 | 19 | |
| Humidity (%) | 70 | 11 | 32 | 94 | 81 | 9.0 | 40 | 100 | |
| Exposure Difference between Case Days and Average over Control Days a | |||||||||
| O3 (µg/m3) | 18 | 16 | 0.0 | 127 | 15 | 11 | 0.0 | 60 | |
| PM10 (µg/m3) | 8.5 | 7.8 | 0.0 | 69 | 13 | 12 | 0.0 | 117 | |
| NO2 (µg/m3) | 4.7 | 3.9 | 0.0 | 32 | 8.4 | 7.1 | 0.0 | 56 | |
a
The relevant exposure term in a case-crossover design.29
SD, Standard Deviation; Min, minimum; Max, maximum.