Behavioral Duration States Occupancy (%I Fequency(cpm)  A/B ratio (%) N States  
Restting 0 0 0 0/0 12
Active 29.7 ± 10.3 32.7 ± 14.8 0.7 ± 0.2 1.4 ± 0.4 14
Intermediate 17.7 ± 3.7 6.4 ± 1.8 0.2 ± 0.03 1.2 ± 0.3 5
Highly active 88.6 ± 14.6 44.1 ± 5.3 0.5 ± 0.3 1.2 ± 0.1 3
Table 1: Quatitative characters of four fetal behaviors.