Table III.

Association between in-transit loss^a of the market pigs and stocking density on a trailer at various summer temperatures

Stocking density (m2/pig)b	Temperature range (number of pigs)
	Mild: 5.7ºC to 20.9ºC (4850)			Moderate: 21ºC to 24.9ºC (4162)			Hot: 25ºC to 34.2ºC (4578)
	IRR	sx̄	P-value	IRR	sx̄	P-value	IRR	sx̄	P-value
≥ 0.503 to ≤ 0.513	NS	NS	NS	2.88	1.493	0.04	NS	NS	NS
≥ 0.490 to ≤ 0.500	NS	NS	NS	2.54	1.202	0.05	NS	NS	NS
≥ 0.457 to ≤ 0.465	NS	NS	NS	4.07	1.647	< 0.001	2.52	0.761	< 0.001
≥ 0.437 to ≤ 0.444	NS	NS	NS	2.54	1.014	0.02	1.97	0.600	0.02
≥ 0.427 to ≤ 0.435	2.12	0.800	0.05	NS	NS	NS	1.81	0.537	0.05
≥ 0.410 to ≤ 0.417	NS	NS	NS	2.58	1.097	0.03	NS	NS	NS
≥ 0.402 to ≤ 0.408	NS	NS	NS	NS	NS	NS	2.21	0.832	0.04

NS — Category not significantly different from the referent density.

^aWithin a temperature range the incidence death rate was approximately the IRR times the incidence death rate for pigs transported at the referent density.

^bEach category was compared with the referent density of ≥ 0.515 m²/pig.