Table 5. Sex differences in USV of MD180 Post and MD360 Post pups.

a. USV number
Group	Male vs. female
	F(1,690)	P
MD180 Post	11.30	0.0008**
MD360 Post	3.81	0.0512
b. USV duration
Group	Male vs. female
	F(1,690)	P
MD180 Post	8.08	0.0046**
MD360 Post	4.61	0.0321*

*P<0.05

** P<0.01