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Table 2 P-values of fixed factors included in the mixed-effects logistic regression models for pre-weaning piglet mortality risk for sows (probabilities of a sow having a piglet death) during early (0–1 days), mid- (2–8 days) and late (9–28 days) lactation

From: Five risk factors and their interactions of probability for a sow in breeding herds having a piglet death during days 0–1, 2–8 and 9–28 days of lactation

Fixed factors1,2 Pre-weaning piglet mortality risk
Early Mid Late
P-value P-value P-value
Parity groups 0.04 < 0.01  < 0.01
Season groups 0.02 0.01 0.10
Piglets born alive (PBA) < 0.01 < 0.01 0.15
Stillborn piglets (SB) < 0.01 < 0.01 < 0.01
Gestation length (GL) < 0.01 < 0.01 < 0.01
Two-way interactions
Parity × season 0.63 0.42 0.05
Parity × PBA < 0.01 0.04 < 0.01
Parity × GL 0.13 0.27 0.16
Parity × SB 0.02 0.03 0.23
Season × PBA 0.20 0.20 0.05
Season × GL 0.98 0.54 0.37
Season × SB 0.33 0.45 0.08
PBA × GL < 0.01 0.28 0.44
PBA × SB < 0.01 0.06 0.09
SB × GL < 0.01 0.05 0.03