Table 3. The Cryptosporidium parvum-positive rate of calves based on different environmental explanatory variables.

Variables	Options n (%)
Flood-Clean	Once per day	Once every 2–3 days	Once every 4–5 days	Once in >5 days
	48/188 (25.5)	4/11 (36.4)	7/17 (41.2)	0
Tank-Clean	Once per day	Once every 2–3 days	Once every 4–5 days	Once in >5 days
	49/195 (25.1)	5/21 (23.8)	6/10 (60)	0
BirthF-Clean	Once per day	Once every 2–3 days	Once every 4–5 days	Once in >5 days
	26/98 (26.5)	3/32 (9.3)	13/50 (26)	18/46 (39.1)
BirthT-Clean	Once per day	Once every 2–3 days	Once every 4–5 days	Once in >5 days
	39/162 (24.1)	12/38 (31.6)	1/7 (14.3)	8/19 (42.1)
Calf-dis	Yes	No
	29/94 (29.8)	32/132 (24.2)
Birth-dis	Yes	No
	5/28 (17.9)	55/198 (27.8)
Close-lac	Yes	No
	42/177 (23.7)	18/49 (36.7)
Yard	Yes	No
	3/33 (9)	57/193 (29.5)
Bedding	Yes	No
	19/60 (31.7)	41/166 (24.7)
Dry-lac	Yes	No
	45/162 (27.8)	15/64 (23.4)