Table 7.

Mixed effects linear regression explaining the average daily weight gain (g/day)

	Coefficient (g/day)	p value	95% confidence interval
Ran. effect: Sow/pen at weaning		8.0 e−4
Constant	94.3	1.1 e−5	52.3	136.3
Producer
Producer A	Baseline
Producer B	35.5	0.006	10.3	60.6
Weight at birth (g)	0.052	7.6 e−6	0.029	0.075
Time of weaning
Weaned at the insertion day	Baseline
Weaned in the farrowing unit	18.8	0.018	3.2	34.3
Body condition score at insertion
Normal or above	Baseline
Below normal	20.6	0.016	3.8	37.4
Days with hollow flanks	− 7.3	1.0 e−14	− 9.1	− 5.4
Days suffering from diarrhea
0 days	Baseline
1 days	3.7	0.641	− 11.8	19.1
2 days	26.0	0.001	10.7	41.2
3 days	28.4	0.004	9.2	47.6
4–6 days	23.2	0.052	− 0.2	46.7
Pen in the nurserya
1 (A, 8.1 kg)	Baseline
2 (A, 6.5 kg)	7.7	0.493	− 14.3	29.7
3 (A, 4.2 kg)	0.9	0.951	− 26.8	28.5
4 (A, 5.5 kg)	-20.4	0.073	− 42.6	1.9
5 (B, 4.8 kg)	-16.2	0.196	− 40.7	8.3
6 (B, 6.5 kg)	1.2	0.918	− -21.1	23.5
7 (B, 6.5 kg)	19.7	0.091	− 3.1	42.6
8 (B, 8.4 kg)	0.0

Average daily weight gain was measured for the first 14 days after insertion to the nursery pigs units at two Danish indoor producers. n = 258

^aPen number (producer, mean weight at insertion)