'vth0' is just a parameter in modelcard file and used to calculate electrical specs such as Ids. If you want to get the real Vth of a mosfet, different methods are used:
1. constant current method(usually used in 0.13um technology node or below )
Vth_cc: Vgs@Ids=Ith*W/L, Ith is a certain value.
2. maximum transconductance method
Vth_gm=Vgmax-Id/gm(max)-Vd/2
I already know this, but the question is whether the "print Vth0" is a good choice to get the Vth. If so, it will be obviously easier to get Vth by this method compared to the others.