Table 6.

Proportion of herds with events, herd incidence rates (IR) or herd incidence proportions (IP) in disease data reported by farmers in a study on baseline recording of disease events in Swedish dairy herds during January, April, July and October 2004, and in data registered in the disease-recording system during the same time period. The data are a subset of the study-data including only herds where the farmer reported all months (n = 148).

	Farmers’ data			Dairy-disease database			p-Valueb
	Herds with events (%)	IP or IR		Herds with events (%)	IP or IR Percentile
		75	90		75	90
Cows; IP
Calving problems	22	0	5.9	10	0	1.9	0.006
Peripartum disorders	20	0	2.2	10	0	0.8	0.015
Puerperal paresis	51	7	11.1	47	5.9	10	0.352
Retained placenta	40	4.9	9.5	20	0	5.6	<0.001
Cows; IR
Abomasal displacement	15	0	4.2	15	0	4.2	0.99
Acetonemia/inappetence	31	5.3	10.9	22	0	8.3	0.036
Clinical mastitis	91	42.1	58.6	82	27.9	45.7	<0.001
Cougha	5	0	0	1	0	0	0.054
Gastro-intestinal disordersa	14	0	4.5	1	0	0	<0.001
Lameness (hoof)	39	7.2	17.2	24	0	8.7	0.002
Lameness (limb)	45	7.7	17.2	2	0	0	<0.001
Laminitis	5	0	0	5	0	0	1
Other disorders	39	5.9	10.4	41	6.1	13.9	0.641
Paresis, not puerperal	23	0	7.5	13	0	4.7	0.022
Ringworm/lice	5	0	0	0	0	0	0.008
Teat tramp	45	10.2	17.4	18	0	6.4	<0.001
Traumatic reticuloperitonitis	8	0	0	5	0	0	0.221
Udder disorders	17	0	6.9	3	0	0	<0.001
Young stock; IR
Cougha	14	0	4.1	3	0	0	0.001
Gastro-intestinal disordersa	36	5.4	14.6	1	0	0	<0.001
Lameness (hoof)	10	0	1.8	7	0	0	0.384
Lameness (limb)	9	0	0	0	0	0	–
Other disorders	23	0	6.5	10	0	1.8	0.002
Ringworm/lice	5	0	0	0	0	0	0.004

^aHerds with outbreaks of cough (n = 5), diarrhoea (n = 7) and ringworm/lice (n = 4), where a major part of the herd was affected, are not included in the respective estimates.

^bDifference in herd incidence distribution between farmers’ data and the disease-recording system was tested with the Wilcoxon rank-sum test.