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. 2021 Oct 14;83(12):1838–1844. doi: 10.1292/jvms.21-0366

Table 1. The definitions of calves and other environmental explanatory variables.

Variable Data type Description
C. parvum Binary The result of PCR detection for Cryptosporidium parvum. This variable was treated as a response variable in the hierarchical logistic regression model for understanding the association between explanatory variables and C. parvum infection.
Farm Categorical Farms where samples and questionnaire data were collected. In total, 20 farms were included in this study. This variable was used as the random effect in the model construction.
Farm size Continuous The number of calves in each farm was used to represent the farm size.
Diarrheal Binary If calves presented with diarrheal symptoms at the time that the sample was collected.
Tank Categorical Results of the PCR screening for Cryptosporidium parvum with samples of tank water. The variable was categorized into negative, positive, and no water tank in the calf rearing enclosure.
Rearing enclosure Binary C. parvum screening results for the swab samples collected from the calf rearing enclosure.
Floor-Clean Order Frequency of floor cleaning in the calves’ enclosure. 1, once per day; 2, once every two–three days; 3, once every four–five days; 4, once in more than five days.
Tank-Clean Order Frequency of water tank cleaning in the calves’ enclosure. 1, once per day; 2, once every two–three days; 3, once every four–five days; 4, once in more than five days.
BirthF-Clean Order Frequency of delivery enclosure cleaning. 1, once per day; 2, once every two–three days; 3, once every four–five days; 4, once in more than five days.
BirthT-Clean Order Frequency of cleaning of the water tank in the delivery enclosure. 1, once per day; 2, once every two–three days; 3, once every four–five days; 4, once in more than five days.
Calf-dis Binary Disinfection of the calves’ enclosure. 1, yes; 0, no.
Birth-dis Binary Disinfection of the delivery enclosure. 1, yes; 0, no.
Close-lac Binary The distance between the calves’ enclosure and the lactating cows’ enclosure. 1, nearby; 0, not close to one another.
Yard Binary Yard provided in the delivery enclosure. 1, yes; 0, no.
Bedding Binary Bedding materials provided in the delivery enclosure. 1, yes; 0, no.
Dry-lac Binary The dry period enclosure and the delivery enclosure are separate. 1, yes; 0, no.
Cow-p Continuous The prevalence of C. parvum in the cows.