TABLE 2.

Results of univariable analyses examining the relationship between variables recorded at the time of sampling or derived from GIS and the isolation of Campylobacter spp. from environmental water samples

Variable and category	No. of samples	Proportion positive	P valuea
Water source
Trough	28	0.11	0.001
Running	30	0.57
Standing	61	0.46
Date sampled (days from start of study)
0-14	27	0.56	0.071 (0.009)
15-29	32	0.47
30-44	28	0.36
45+	30	0.23
Sun
Overcast	57	0.42	0.62
Some cloud	42	0.33
Clear	16	0.44
Rain
Dry	86	0.35	0.11
Rain	29	0.52
Ground condition
Wet	52	0.38	0.69
Dry	69	0.42
Bovine fecal pat count
0	42	0.36	0.65 (0.33)
1-30	18	0.33
31-90	29	0.48
91+	32	0.44
Avg pat age
No pats present	39	0.31	0.28
Old	49	0.43
Young	33	0.48
Level of recent fecal contamination
None found	46	0.37	0.59 (0.70)
Low	39	0.41
Moderate	12	0.58
High	24	0.38
Soil type
Nonclay	26	0.23	0.04
Clay	95	0.45
Distance to built land (km)
0-0.1	24	0.38	0.95(0.55)
0.1-0.2	41	0.39
0.2-0.3	35	0.43
0.3-0.7	20	0.45
Distance to hedge (km)
0-0.07	27	0.37	0.92(0.70)
0.07-0.15	53	0.40
0.15-0.22	26	0.46
0.22-0.37	13	0.38
Distance to wood (km)
0-0.44	35	0.37	0.78(0.38)
0.44-0.87	41	0.37
0.87-1.31	28	0.46
1.31-1.97	15	0.47
Amt of runoff received (arbitary units)
1	47	0.45	0.41 (0.77)
2-10	37	0.32
11-60	21	0.52
61-1,278	15	0.33
Catchment area
0	66	0.39	0.22
1	20	0.50
2	11	0.45
3	1	1.00
4	8	0.63
5	10	0.10
6	4	0.25
Aspect
No aspect	47	0.32	0.11
North facing	43	0.53
South facing	29	0.38

^aP values were derived from chi-square tests for differences between groups. P values from chi-square tests for trend are in parentheses.