Ultrasound Determination of Gestational Age Using Placental Thickness in Female Dogs: An Experimental Study

Table 1

Comparison between gestational age and reported age averages for the three evaluated breeds and statistical analysis.

Breed	𝑛	Average		Standard deviation		Average standard error		𝑃 value
		RGA	GA	RGA	GA	RGA	GA
Small size	138	45.78	38.49	9.94	6.09	0.85	0.52	<0.001^*
Medium size	108	45.10	41.62	11.12	7.22	1.07	0.69	<0.001^*
Large size	90	42.74	41.76	9.24	7.37	0.97	0.78	0.030^*

𝑛: number of female dog, RGA: reported gestational age, GA: gestational age obtained considering the curves adjustment.
^*Student’s 𝑡-test.