No it is not helpful

This is because a normal CTG has alternating phases with very different qualities

Quiet sleep is characterised by a low STV

Active sleep is characterised by a high STV

The two phases alternate in unpredictable ways. Thus, such an episode may happen at the beginning, in the middle or at the end of a trace. If it happens at the end, the STV will be low but only because the active sleep is only a small part of the total. If it happens right from the start, criteria will be met early (for example at 10 mins) and the STV will be high because active sleep occupies the whole of the trace. If there is no episode of high then the STV will be low and even lower if the baby is not merely asleep but stuporose or even comatose. At 60 mins with only quiet sleep, a very low STV indicates a sicker baby. In short, a long sample (60mins) of the trace is needed to prove that the baby is not going to wake up. If the baby does wake up then the STV will reflect what proportion of the whole trace shows active sleep (with its contribution of High STV)]

If the baby stays quietly asleep for too long, something is wrong. But all healthy babies wake up within an hour. An episode of active sleep is needed to pass DR criteria and prove normality.

The criteria can be met if there are no movements however, the criteria are not likely to meet quickly. The criteria are at least one fetal movement or three accelerations. The analysis only uses maternally sensed movement. An USS could be performed to confirm whether the baby is actually moving and not being felt by the mother (eg anterior placenta) or whether the baby is really not moving. If the baby is not moving because it is unwell, then the criteria are not likely to meet and the STV needs to be observed (after 60 minutes).