an epidemiological study of listeriosis in dairy cattle

in a covered barn 73 595 0.8 (0.4-1.5) 0.5
outside covered 6 55 0.9 (0.3-2.2) 0.9
outside uncovered 13 85 1.2 (0.6-2.4) 0.6
month of making
drying
July 8 63 1.00
August 28 193 1.14
September 3 41 0.58 0.5 X
dried 34 264 1.02 (0.62-1.6) 0.9
days 0 R 51 396 1.00
1 7 73 0.74
2 11 82 1.04
3 16 109 1.14 0.7 X
big bale straw 26 163 1.4 (0.8-2.3) 0.3
type of straw
wheat 18 110 1.34 (0.7-2.5) 0.4
barley 10 106 0.77 (0.35-1.66) 0.6
combinations 12 85 1.2 (0.57-2.47) 0.7
Type of housing: Cubicles
Y N OR (95% CL) p Value
used 77 608 1.5 (0.8-2.9) 0.2
type of floor
earth 13 88 1.2 (0.6-2.4) 0.7
hard core 6 62 0.7 (0.3-1.9) 0.6
concrete 55 461 0.8 (0.5-1.4) 0.5