significantly not differentp = 0.88425
The latency of head raising was significantly not different at different treatment, mean effect of treatment (F [1,72] =0.03978 ; p = 0.88425), mean effect of age (F [3,72] =3.317 ; p = 0.0246) and interaction (F [3,72] =2.801 ; p = 0.0460) (Fig. 2 ).