Compared with baseline PI scores ( median , 5.33 ; range , 1.17 to 9.33 ) , dogs had significantly lower PI scores 2 weeks ( median , 3 ; range , 0.67 to 6.83 ) and 4 weeks ( median , 3.33 ; range , 0.67 to 6.67 ) after administration of anti-NGF mAb .