The trend of the effects of the PRP on lung function was towards increases , but there was no statistical difference between the intervention and control groups at the end of the sixth week in the values of FVC ( p = 0.2 ; 95 % CI -0.9 to 0.51 ) as well as FEV1 ( p = 0.1 ; 95 % CI -0.07 to 0.51 ) .