A cross sectional study of the prevalence, risk factors and population attributable fractions for limb and body lesions in lactating sows on commercial farms in England

Table 9 Two level binomial logistic regression models of the risks associated with limb lesions in lactating sows from 82 indoor farms in Britain

	Wounds n = 267		Calluses n = 255		Bursitis n = 276		Cap. hock n = 268
Intercept coefficient	0.3		2.2		1.1		-4.0
	OR	CI	OR	CI	OR	CI	OR	CI
Week of lactation	0.6	0.4, 0.8*	1.3	1.0, 1.8	1.5	1.2, 1.8*	1.2	0.9, 1.5
Body condition score	0.7	0.4, 1.4	0.6	0.3, 1.2	0.4	0.2, 0.7*	1.8	1.0, 3.4
Floor/bedding
Solid with bedding
Partly slatted with bedding	1.0	0.2, 4.5	3.9	1.1, 13.4*	1.8	0.7, 4.8	1.4	0.4, 4.9
Partly slatted no bedding	3.2	0.9, 12.1	4.4	1.4, 13.4*	1.2	0.5, 2.8	3.5	1.2, 10.7*
Fully slatted	5.7	1.2, 26.6*	8.9	2.0, 38.6*	0.8	0.3, 2.3	3.8	1.04, 14.2*
Initial response to human presence¹
Bright alert and responsive
May be dull					1.2	0.7, 2.1	2.3	1.2, 4.0*
Dull and unresponsive					2.7	1.1, 7.0*	2.3	0.9, 6.3
Space between sow's back and the crate
<5 cm
5-10 cm			0.2	0.1, 0.9*
>10 cm			0.2	0.1, 0.8*
Dry slurry in the sow lying area
No
Yes	0.2	0.05, 0.8*					0.2	0.1, 0.6*
Random effects	Var.	SE	Var.	SE	Var.	SE	Var.	SE
Variation between farms	0.9	0.4	0.7	0.4	1.1	1.0	0.4	0.3
Hosmer-Lemeshow goodness-of-fit	χ²	P value	χ²	P value	χ²	P value	χ²	P value
	8.1	0.15	1.3	0.93	3.3	0.66	3.8	0.60

¹[12]
*CI does not include unity therefore the factor is significantly different from the reference category (p < 0.05)

ISSN: 1746-6148