TABLE 3.

Results of univariable analyses examining the relationship between isolation of Campylobacter spp. from environmental water samples and variables related to the laboratory method, the presence of wildlife feces, and the isolation of Campylobacter spp. from environmental samples taken in the adjacent area

Variable and category	No. of samples	Proportion positive	P valuea
Time to processing (days; date processed − date sampled)
0	40	0.38	0.73 (0.48)
1-2	24	0.33
3-4	25	0.48
5+	21	0.43
pH of filtrate
6-8.3	53	0.45	0.32
8.4-11	53	0.36
Vol filtered (ml)
0-49	22	0.32	0.74 (0.28)
50-149	35	0.40
150-249	21	0.43
250+	32	0.47
No. of bovine fecal samples positive for Campylobacter spp.
0	54	0.39	0.47 (0.53)
1-4	15	0.27
5-10	21	0.52
11+	31	0.42
Campylobacter spp. isolated from bird
No	90	0.40	0.85
Yes	31	0.42
Bird feces found
No	45	0.38	0.64
Yes	76	0.42
Campylobacter spp. isolated from rabbit
No	106	0.42	0.55
Yes	15	0.33
Rabbit feces found
No	57	0.39	0.69
Yes	64	0.42
E. coli isolated from sample
No	37	0.38	0.69
Yes	84	0.42

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