Table 1.

Measurements used in the assessment

Measurements	Definitions
Pigs requiring hospitalization
Yes	Pigs that would benefit from removal to a hospital pen
No	Pigs that would not benefit from removal to a hospital pen
Lame pigs
Lame	Pigs with signs of lameness
Non lame	Pigs without any sign of lameness
Pigs with tail lesions
Severe	Pigs with severe tail lesions. Proportion of tail has been removed by biting or tail is swollen or held oddly, or scab covering whole tip or fresh blood visible
Mild	Pigs with mild tail lesions
No lesions	Pigs without any of the above lesions
Dirty	Pigs dirty enough to obscure potential mild lesions
Pigs with body marks
Severe	Pigs with severe body marks extending into deeper layers of skin or lesions covering a large percentage of skin
Mild	Pigs with mild body marks
No lesions	Pigs without any of the above body marks
Dirty	Pigs dirty enough to obscure potential mild body marks
Enrichment use
Enrichment	Pigs interacting with enrichment in the pen
Other	Pigs interacting with other pen features or pen mates

Each pig in the sample selected was classified into one of the several levels for each measurement (the classification for Enrichment use only concerns the active pigs of the sample). Detailed definition in Supplementary Table S1.