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. 2016 Jul 14;48:51. doi: 10.1186/s12711-016-0230-0

Table 2.

Summary statistics and genetic parameters for S/P^a ratio across the gilt acclimation and outbreak datasets

Item	Gilt acclimation dataset^b					Outbreak dataset
Item	S/P_0%	S/P_25%	S/P_50%	S/P_75%	S/P_100%	Outbreak dataset
Mean	1.19	1.36	1.40	1.45	1.55	1.79
Standard deviation	0.72	0.61	0.57	0.53	0.48	0.38
Seropositive rate (%)	81.0	92.3	95.4	97.9	100.0	100.0
Number of
Animals	2364	2073	1969	1849	1361	607
Contemporary groups	95	83	79	73	56	1
Commercial herds	23	21	21	20	20	1
Multiplier herds	17	15	15	14	14	1
Genetic suppliers	7	7	7	7	7	1
Heritability	0.275	0.297	0.375	0.449	0.474	0.536
Standard error	0.041	0.045	0.046	0.047	0.057	0.110
Genetic variance	0.053	0.066	0.079	0.090	0.086	0.078
Residual variance	0.141	0.156	0.131	0.111	0.095	0.067

^aSample-to-positive ratio

^bSubscripts for each S/P dataset represent the minimum percentage of PRRSV-seropositive animals within contemporary group