Attached is the original validation paper for the VOS. Do you mean Table 4? The score was only moderately correlated to a change in PT etc. ('Validity of the VOS'); if you calculate the r2, these are relatively low (20-25%).

Dear sir,

Thank you a lot for your answer. I already have this document, what I'm looking for is how to calculate a global score when patient have given answers? would you have an idea? 

Hope to read you soon

Instruments that assess quality of life allow the measurement of the individual's perception about effect of an illness on their personal, social and professional relations .Somtimes a sigle tool like V-RQOL  many not be sufficient to assess the impact specific illnessess as  it is has been observed V-RQOL  has  lot  of significace in the assessment of patients following thyroplasty for unilateral vocal cord paralysis but not significant  in assessment alayngeal population So multiparameters like V-RQOL, VHI, VAPP can be used  for individuals with different vocal problems