Table 2.

Summary of variables included in the regression models for F. hepatica in UK dairy herds (n = 606) (Names in brackets are abbreviations)

Categorical variables	% of farms positive for variable			Missing
Beef cattle on farm (Beef)	47.4			266
Boggy grazing land used (Boggy)	63.2			288
Water source used by cattle (Water)				283
Piped water supply only (coded 0 in analysis)	73.7
Access to river/stream/canal/ditch/pond (coded 1)	26.3
Agricultural Land Classification (ALC) Grade 1	0.8			121
2	11.2
3	73.0
4	14.5
5	0.4

Continuous variables	Mean	SD	Range	Missing
Milking herd size. Log used for analysis (Cows)	153.3	21.01	23-516	83
Total youngstock. Log used for analysis (Youngstock)	135.92	110.41	0-710	282
Stocking rate. Log used for analysis (Stockrate)	1.82	1.47	0-10	340
Average daily rainfall (mm) over August, September and October, averaged over 2007-2011 (Rainfall)	79.01	21.02	53.23-158.74	0
Slope of land in degrees (Slope)	2.29	2.02	0-15.1	0
Texture of soil is very fine sand (Vfsand)	7.42	6.04	0-43.3	0
Average minimum temperature (°C) over May, June and July, averaged over 2007-2011 (T)	9.86	0.67	7.40-11.65	0
Improved grass	47.93	20.84	0-97.6	0