Table 1.

Relative distribution of lameness data sources across the identified papers (n = 69) for the chronological overview of lameness classification methods.

Lameness data source	% (n)
Farm records	31.9% (22)
9-point scale Manson and Leaver (1988) (62)	21.7% (15)
4-point scale AHDB Dairy (2020) (7)	10.1% (7)
4-point scale Whay et al. (2003) (28)	7.2% (5)
6-point scale Thomas et al. (2016) (63)	4.3% (3)
3-point scale Amory et al. (2006) (31)	4.3% (3)
3-point scale Walker et al. (2008) (64)	2.9% (2)
Vet and farm records	2.9% (2)
Vet records	2.9% (2)
4-point scale Phillips (1990) (65)	1.4% (1)
4-point scale Rutherford et al. (2009) (66)	1.4% (1)
5-point scale Flower and Weary (2006) (67)	1.4% (1)
5-point scale Galindo and Broom (2000) (68)	1.4% (1)
5-point scale Haskell et al. (2006) (69)	1.4% (1)
5-point scale Sprecher et al. (1997) (70)	1.4% (1)
5-point scale Tranter and Morris (1991) (71)	1.4% (1)
Automated system	1.4% (1)