Table 2.

Summary statistics of the final set of studies reporting lameness frequency levels in British dairy cattle (n = 68).

Variable	Category	% of papers (n)
Start of data collection (year) 1	Before 1995	23.5% (16)
	1995 and onwards	76.5% (52)
Start of data collection (year) 2	Before 2000	38.2% (26)
	2000 and onwards	61.8% (42)
Start of data collection (year) 3	Before 2005	58.8% (40)
	2005 and onwards	41.2% (28)
Start of data collection (year) 4	Before 2008	66.2% (45)
	2008 and onwards	33.8% (23)
Start of data collection (year) 5	Before 2010	76.5% (52)
	2010 and onwards	23.5% (16)
Breed	Holstein/Friesian/Holstein-Friesian	67.6% (46)
	Other 4	20.6% (14)
	Not reported	11.8% (8)
Calving pattern	Year-round	23.6% (16)
	Other	27.9% (19)
	Not reported	48.5% (33)
Grazing regime	Grazing	35.3% (24)
	Other	30.9% (21)
	Not reported	33.8% (23)
Housing system	Cubicle	48.5% (33)
	Other	22.1% (15)
	Not reported	29.4% (20)
Milking system	Conventional	57.4% (39)
	Other	2.9% (2)
	Not reported	39.7% (27)
Study farm(s) belonging to research institute	Yes	23.5% (16)
	No	76.5% (52)
Study Type	Experimental	26.5% (18)
	Observational	73.5% (50)
Study design	Cross-sectional	10.3% (7)
	Longitudinal	57.4% (39)
	Negatively controlled RCT	2.9% (2)
	Positively controlled RCT	1.5% (1)
	Retrospective longitudinal	27.9% (19)
Study unit	Cow	77.9% (53)
	Culled cow	5.9% (4)
	Heifer	10.3% (7)
	Lactation	5.9% (4)
Lameness data source	Mobility scoring system	57.3% (39)
	Records	41.2% (28)
	Other	1.5% (1)
Sample size a	Less than 1,230 animals	52.9% (36)
	1,230 animals or more	47.1% (32)
Sample size b	Less than 5 farms and/or 1,230 animals	63.2% (43)
	At least 5 farms and 1,230 animals	36.8% (25)