Table 2.

Parameters of Lognormal distribution fitting the intra-herd transmission coefficients estimated at the herd level using data from herds of Madrid in 1997–2009 after exclusion of outliers (n = 17)

Productive type	Number of herds	Mean	Median	Standard deviation
Beef	181	2.77	2.32	1.81
Dairy	74	4.69	3.82	3.37
Bullfighting	26	2.45	2.11	1.37
Total	281	3.24	2.59	2.40