In the present study, a main finding is the sustained 10%
improvement on the PCS (76.3% of the population) up to 5 months
and on GPE (60.3%) up to 12 months. For MCS this 10% improvement
is slightly less (20.6%) at 5 months, but a mean of 50 (SD of 10)
represents normal health and function (Walsh et al., 2003). Some
patients reported no improvement on GPE at 5 and 12-months
follow-up (15% and 20.6%, respectively).