Inclusion and exclusion criteria are listed in Table 1. Children with CP were able to walk
with a hand held assistive device if it did not restrict movement of the trunk or pelvis. The
selection of months of walking experience rather than age as a primary inclusion criterion
was chosen based on reports that experience is a stronger predictor of walking and balance
skill than age in early walkers [Adolph et al., 2003; Sundermier et al., 2001]. The onset of
walking was operationally defined as the age in months at which an infant or child was able
to take at least 3 continuous independent steps on a consistent basis [Roncesvalles et al.,
2001; Wu et al., 2007]. Walking experience, in months, was calculated as the difference in
the participant’s current age and the age of onset of walking