Table 1.

Logistic regression model examining the association between diarrhoea in 144 calves during the first 6 weeks of life and the concentration of Cryptosporidium, the concentration of Giardia oocysts in faecal samples, and age at sample collection. Calves were added as random intercepts. Final model is presented.

Variable (n = no. of samples)	OR	Confidence interval 95%	P-value
Cryptosporidium negative (n = 437)	1.0	–	–
Cryptosporidium low (n = 109)	1.93	1.23; 3.03	0.004
Cryptosporidium high (n = 109)	2.22	1.39; 3.56	0.001
Giardia negative (n = 453)	1.0	–	–
Giardia low (n = 101)	1.45	0.83; 2.55	0.192
Giardia high (n = 101)	1.58	0.91; 2.74	0.102
Age at sample collection (days)	0.98	0.96; 0.99	0.007

n (observations) = 655, average n (observations) per calf = 4.5.