Table 2. Correlation between potential risk factors for stillbirth in 568 piglets born from 45 Landrace × Yorkshire sows on a farm in Vietnam.

	P	GL	LS	BO	Gender	CRL	BW	BMI	PI	BI
GL	−0.07
LS	0.01	0.096a
BO	−0.03	0.05	0.220b
GD	0.00	0.00	0.02	0.04
CRL	0.08	0.03	−0.123b	−0.06	0.06
BW	0.07	0.111b	0.06	0.089a	−0.01	−0.02
BMI	0.191b	−0.08	−0.195b	−0.108b	0.108b	0.258b	−0.285b
PI	0.07	−0.097a	−0.08	−0.116b	0.04	−0.02	−0.128b	0.582b
BI	0.06	0.087a	−0.02	0.03	−0.03	−0.01	0.03	−0.04	−0.04
CFD	0.07	0.08	0.121b	0.673b	0.04	−0.01	0.04	0.02	−0.04	0.257b

P: Parity, GL: Gestation length, LS: Litter size, BO: Birth order, CRL: Crown-rump length, BW: Birth weight, BMI: Body mass index, PI: Ponderal index, BI: Birth interval, CFD: Cumulative farrowing duration, GD: Gender.

^adenotes significance level < 0.05.

^bdenotes significance level < 0.01.