Table 3.

Pig movements assortativity between regions, and between farm types for all premises involved in ScotEID between January 2012 and May 2013

Groups	Emit E-I index overall	Emit E-I index weekly	Receive E-I index overall	Receive E-I index weekly
Farm Type a
Professional producers	−0.54	−0.53 (−0.72 – −0.38)b	−0.57	−0.56 (−0.67 – −0.46)
Non assured commercial producers	0.52	0.53 (0.42 – 0.67)	0.34	0.29 (0.09 − 0.46)
Small producers	−0.79	−0.78 (−0.89 – −0.69)	−0.26	−0.24 (−0.43 – −0.1)
Region c (non-slaughter)
Highlands and Islands	−0.37	−0.36 (−0.60 – –0.15)	−0.65	−0.64 (−0.88 – −0.44)
Mid Scotland and Fife	−0.22	−0.24 (−1.00 – 0.33)	0.18	0.09 (−0.14 – 0.43)
Scotland Central Belt	−0.04	0.05 (−0.25 – 0.43)	0.38	0.28 (−0.04 – 0.71)
South Scotland	0.22	0.17 (−0.06 – 0.41)	−0.08	−0.15 (−0.50 – 0.20)
East Scotland	−0.59	−0.59 (−0.78 – −0.40)	−0.83	−0.83 (−0.88 – −0.79)
Region d (slaughter)
Highlands and Islands	−0.44	−0.41 (−0.57 – −0.29)	−0.98	−0.98 (−1.00 – −1.00)
Mid Scotland and Fife	0.07	0.08 (−0.05 – 0.18)	−0.18	−0.19 (−0.38 – −0.07)
Scotland Central Belt	0.33	0.25 (0.00 – 0.55)	0.77	0.60 (0.30 – 0.88)
South Scotland	0.15	0.17 (0.07 – 0.26)	−0.33	−0.32 (−0.42 – −0.24)
East Scotland	0.23	0.18 (−0.22 – 0.48)	−0.63	−0.61 (−0.69 – −0.53)

Bold numbers show where the computed mean weekly External–internal (E-I) index of pig movement connections was considered significantly different from the non-assortativity hypothesis (i.e. when the confidence envelop around the mean, as defined by ±2SD, does not overlap zero).

^aEstimates computed for movements involving agricultural holdings only.

^bMean and the Q1-Q3 range of the distribution of the computed E-I index for the 73 complete weeks recorded in the study period.

^cOnly Scottish regions are reported, estimates computed for movements involving agricultural holdings and gathering places.

^dOnly Scottish regions are reported, estimates computed for movements to slaughter only.