4280
Significant reductions were noted in vertical GRFs per newton of body weight exerted at 10 % ( P = 0 . 0009 ) and 20 % ( P = 0 . 0383 ) of stance phase and in anteroposterior GRFs exerted at 10 % ( P = 0 . 0009 ) and 50 % ( P = 0 . 0033 ) of stance phase when ambulation was compared with and without the orthotic device .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None