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

Table 2

Difference between gestational ages calculated by curves adjustments and reported age averages for small, medium, and large size 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	45.59	9.94	9.19	0.85	0.78	0.617
Medium size	108	45.10	44.90	11.12	10.25	1.07	0.99	0.642
Large size	90	42.74	42.81	9.24	10.36	0.97	1.09	0.890

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