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Table 4 Estimates (standard error: SE) and P-values of piglets born alive and sow herd size group in the mixed-effects model for age of piglet death in 91 herds

From: A 10-year trend in piglet pre-weaning mortality in breeding herds associated with sow herd size and number of piglets born alive

Effects Ages of piglets died (%)
Estimate (SE) P-value
Intercept (SE)a 0.4731 (0.4417) 0.26
Piglets born alive − 0.3351 (0.2121) 0.10
Piglets born alive squared −0.0955 (0.0402) 0.02
Sow herd size group −0.0762 (0.4710) 0.87
Sow herd size group x Piglets born alive −0.0347 (0.1430) 0.80
Year 0.3585 (0.0879) <  0.01
Year x Year −0.0170 (0.0053) <  0.01
Year x Piglets born alive 0.1220 (0.0245) < 0.01
Year x Sow herd size group 0.0061 (0.0570) 0.90
Stillborn piglets −0.8707 (0.3640) 0.92
Piglets born alive x Stillborn piglets −0.8851 (0.7457) 0.16
Year x Stillborn piglets −0.0491 (0.0551) 0.37
Sow herd size group x Stillborn piglets 0.2414 (0.3146) 0.44
  1. aSEs were obtained from the statistical model