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Table 2 Estimates (standard error: SE) and P-values of piglets born alive and sow herd size in the mixed-effects model for pre-weaning mortality 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 Pre-weaning mortality (%)
Estimate (SE) P-value
Intercept (SE)a 12.388 (0.625) <  0.01
Piglets born alive 1.217 (0.366) <  0.01
Piglets born alive squared −0.202 (0.079) 0.01
Sow herd size group 1.845 (0.779) 0.03
Sow herd size group x Piglets born alive 0.577 (0.290) 0.04
Year 0.090 (0.147) 0.96
Year x Year −0.020 (0.012) 0.05
Year x Piglets born alive −0.012 (0.052) 0.77
Year x Sow herd size group −0.014 (0.102) 0.04
Stillborn piglets 2.621 (0.686) <  0.01
Piglets born alive x Stillborn piglets 0.059 (0.275) 0.82
Year x Stillborn piglets 0.112 (0.101) 0.30
Sow herd size group x Stillborn piglets −0.471 (0.633) 0.46
  1. aSEs were obtained from the statistical model