Table 3 Descriptive statistics of clinical mastitis (CM) registration and cow information in farmer-recorded data (FRD) and retrieved from the national cattle common disease databases (CoDDs) in four Nordic countries in 2008

Number of cows

13,548

6,287

6,387

8,896

Cow-years

3,118

1,566

1,552

2,316

Number of herds with CM (% of study herds)

98 (93)

99 (94)

136 (81)

105 (63)

131 (73)

121 (68)

106 (81)

102 (71)

Median number of CM cases per study herd (p10, p90)^a

6 (1; 17)

9 (2; 27)

2 (0; 8)

1 (0; 5)

2 (0; 5)

1 (0; 5)

3 (0; 9)

1 (0; 8)

Number of cows with CM

873

1,031

492

270

357

326

478

371

Number of CM cases (% veterinary-visited)^b

938 (85)

1,218

536 (89)

301

379 (87)

359

498 (83)

404

Number of farmer-recorded (FR) CM events (% with a second diagnosis^c on the recording sheet)

974 (4.8)

545 (11.2)

391 (12.8)

511 (11.7)