Table 4.

Descriptive statistics of number born dead piglets of different farrowing duration.

Farrowing Duration (Minute)	Number of Litters (Frequency %)	Number Born Dead	Stillbirth Rates
0–180	4192 (13.02)	0.21 d ± 0.52	1.83%
>180–240	10,607 (32.94)	0.23 d ± 0.54	1.96%
>240–300	11,621 (36.09)	0.25 c ± 0.55	2.19%
>300–360	3980 (12.36)	0.33 b ± 0.65	2.85%
>360–600	1800 (5.59)	0.45 a ± 0.86	3.87%

^a–d Values within a column with different superscripts differ significantly at p < 0.05.