PPT values at baseline , after 3 weeks of treatment , and at 3 - and 9-week follow-up for the TTM group were 2.71 1.22 , 3.57 1.41 , 3.72 1.46 , and 3.42 1.46 pounds/cm ( 2 ) , respectively ; values in the sham ultrasound group were 2.85 1.20 , 2.62 1.07 , 2.58 1.05 and 2.63 0.94 pounds/cm ( 2 ) .