. 2015 Apr 12;77(9):1071–1077. doi: 10.1292/jvms.14-0480

Table 3. The means age of the fetuses in porcine reproductive and respiratory syndrome (PRRS) virus positive and negative specimens.

Specimen	PRRS virus negative		PRRS virus positive

	N	age of fetuses	N	age of fetuses
Aborted fetuses	11	71.4 ± 22.3^{a, A)}	21	75.3 ± 29.0^{a, A)}
Mummified fetuses	11	94.1 ± 23.5^{a, B)}	19	104.2 ± 16.1^{a, B)}
Stillborn piglets	7	113.2 ± 1.9^{a, B)}	20	115.0 ± 1.3^{a, B)}

Total	29	88.6 ± 25.7^a)	60	95.9 ± 26.0^a)

a, b) Different superscripts within rows indicate statistically significant differences (P<0.05). A, B) Different superscripts within columns indicate statistically significant differences (P<0.05).