Table 5.

The yearly status of herds in NI relative to the number of samples taken per herd for the years 2011–2013, respectively. Note, the cut-point where there were no fluke free herds was 160 animals sampled in 2011, 227 in 2012, and 302 in 2013

Herd status (2011)				Samples
	1–4	5–9	10–19	20–39	40–79	80–159	>160	Total
0	4,019	543	225	93	7	3	0	4,890
%	64.46	28.16	12.14	5.26	0.59	0.53	0	35.16
1	2,216	1,385	1,629	1,676	1,188	562	361	9,017
%	35.54	71.84	87.86	94.74	99.41	99.47	100	64.84
Total	6,235	1,928	1,854	1,769	1,195	565	361	13,907
Herd status (2012)
	1–4	5–9	10–19	20–39	40–79	80–159	>160	Total
0	4,255	600	325	127	35	3	1	5,346
%	69.91	31.88	17.74	7.35	2.94	0.52	0.28	39.15
1	1,831	1,282	1,507	1,602	1,155	576	356	8,309
%	30.09	68.12	82.26	92.65	97.06	99.48	99.72	60.85
Total	6,086	1,882	1,832	1,729	1,190	579	357	13,655
Herd status (2013)
	1–4	5–9	10–19	20–39	40–79	80–159	>160	Total
0	3,508	560	289	98	36	7	4	4,502
%	68.68	32.60	16.71	5.58	3.04	1.24	1.07	36.2
1	1,600	1,158	1,441	1,657	1,148	559	370	7,933
%	31.32	67.40	83.29	94.42	96.96	98.76	98.93	63.8
Total	5,108	1,718	1,730	1,755	1,184	566	374	12,435
Grand total negative	11,782	1,703	839	318	78	13	5	14,738
Grand total positive	5,647	3,825	4,577	4,935	3,491	1,697	1,087	25,259
Grand total	17,429	5,528	5,416	5,253	3,569	1,710	1,092	39,997