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Table 2 Single variate analysis of risk factors

From: E. coli O157 on Scottish cattle farms: Evidence of local spread and persistence using repeat cross-sectional data

Variable Odds Ratio (95%CI) p
Farm positive Survey 1 1.68 (1.00-2.83) 0.051
Farm in sampling cluster positive 2.97 (1.83-4.81) <0.001
Season   0.162
Spring 1.52 (0.71-3.25) 0.277
Summer 2.23 (1.08-4.86) 0.298
Autumn 1.89 (0.90-3.95) 0.091
Winter - -
Animal Health Division   0.137
Island 0.21 (0.07-0.66) 0.008
Highland 0.75 (0.35-1.61) 0.460
North East 0.63 (0.29-1.35) 0.231
Central 0.61 (0.28-1.34) 0.215
South East 0.81 (0.43-1.84) 0.749
South West - -
Management: dairy 2.23 (1.26-3.96) 0.006
Management: beef cattle 0.57 (0.36-0.93) 0.023
Management: change 1.93 (0.98-3.80) 0.058
Pigs present 2.63 (0.92-7.45) 0.070
Farm size: large area (>100km2) 1.57 (0.97-2.56) 0.069
Farm size: farm area (km2) 1.93 (1.00-3.61) 0.040
Total number of cattle 3.85 (2.04-7.26) <0.001
Farms within 1 km 1.53 (0.90-2.61) 0.120
Any movementa (open vs closed) 2.54 (0.98-6.60) 0.057
Movement within 1 week of sampling 2.40 (1.24-4.64) 0.010
Movement within 2 week of sampling 2.01 (1.10-3.68) 0.023
Movement within 3 week of sampling 1.88 (1.07-3.32) 0.029
Movement within 4 week of sampling 2.24 (1.33-3.76) 0.003
Movement within 8 week of sampling 2.10 (1.29-3.41) 0.003
No. cattle moved within 4 weeks of sampling 2.94 (1.38-6.23) 0.005
No. cattle moved within 8 weeks of sampling 2.57 (1.41-4.68) 0.002
Arable agriculturalb 1.66 (0.90-3.08) 0.108
Any E. coli non O157 present 1.73 (1.06-2.80) 0.027
  1. Variables identified from single variate logistic regression models for the presence of E. coli O157 on the 447 Scottish farms that were sampled in both Survey 1 (SEERAD, 1998-2000) and Survey 2 (IPRAVE, 2002-2004).
  2. a Movement (as defined by Cattle Tracing System (CTS) [20]) is deemed to have occurred when an animal is moved on to a specific farm or between herds.
  3. b Arable agriculture (Land Capability for Agriculture class 1-3.1). Prime agricultural land capable for being used to produce a wide range of crops. Favourable climate; slopes are no greater than 7 degrees; soils are at least 45 cm deep; imperfectly drained [21].