Table 5.

Regression terms for the relationship between piglet birth weight¹ and weaning weight within Litter Size treatment

Item1,2	Coefficient3	Adjustment4	SE	P-value5
Intercept, kg
Decreased	6.33	–	0.135	<0.0001
Adjustment for Control	–	−0.35	0.134	0.01
Adjustment for Increased	–	−0.38	0.133	0.004
Linear term, kg weaning weight per kg birth weight
Decreased	2.88	−	0.284	<0.0001
Adjustment for Control	–	−0.36	0.389	0.36
Adjustment for Increased	–	−0.45	0.385	0.24
Quadratic term, kg weaning weight per kg birth weight squared
Decreased	−1.16	–	0.356	0.001
Adjustment for Control	–	−0.07	0.910	0.94
Adjustment for Increased	–	−0.11	0.902	0.90
Model R2	0.39	–	–	–

¹Using centered birth weight, with a mean of 1.46 kg. The regression model included Litter Size treatment, linear and quadratic birth weight, the interactions of birth weight with Litter Size treatment, and the random effect of block.

²Decreased = 2 piglets less than the sow functional teat number; Control = the same number of piglets as the sow functional teat number; Increased = 2 piglets more than the sow functional teat number.

³Intercept and slope for the Decreased treatment.

⁴Adjustment to intercept or slope for the Control or Increased treatments.

⁵For the Decreased treatment, P-values indicate whether the intercept or slope are different to 0. P-values for the Control and Increased treatments indicate differences for intercept or slope compared to the Decreased treatment.