Figure 5.

Spontaneous locomotor activity during free play for Bellevue (green) and Langone (purple) samples for percentage of session spent walking, step rate (total number of steps divided by total time in motion), and percentage of short bouts (number of bouts with 1–3 steps divided by the total number of bouts). Each symbol represents data from one infant. Horizontal bars denote group averages. Asterisks denote significant group differences (*p <. 05). Across samples, time in motion ranged from 8–40% of the session, step rate ranged from 90 to 170 steps/minute, and the percentage of short (1–3 step) bouts ranged from 20 to 70%.