******************************************************************
*STATA syntax code for the computation of index*
*values with the Italian value set (TTO)*
******************************************************************;

gen disut_mo = .
replace disut_mo = 0 if missing(disut_mo) & mobility == 1
replace disut_mo = 0.076 if missing(disut_mo) & mobility == 2
replace disut_mo = 0.518 if missing(disut_mo) & mobility == 3

gen disut_sc = .
replace disut_sc = 0 if missing(disut_sc) & selfcare == 1
replace disut_sc = 0.1 if missing(disut_sc) & selfcare == 2
replace disut_sc = 0.289 if missing(disut_sc) & selfcare == 3

gen disut_ua = .
replace disut_ua = 0 if missing(disut_ua) & activity == 1
replace disut_ua = 0.085 if missing(disut_ua) & activity == 2
replace disut_ua = 0.198 if missing(disut_ua) & activity == 3

gen disut_pd = .
replace disut_pd = 0 if missing(disut_pd) & pain == 1
replace disut_pd = 0.098 if missing(disut_pd) & pain == 2
replace disut_pd = 0.334 if missing(disut_pd) & pain == 3

gen disut_ad = .
replace disut_ad = 0 if missing(disut_ad) & anxiety == 1
replace disut_ad = 0.095 if missing(disut_ad) & anxiety == 2
replace disut_ad = 0.213 if missing(disut_ad) & anxiety == 3

gen D1 = (mobility >= 2) + (selfcare >= 2) + (activity >= 2) + (pain >= 2) + (anxiety >= 2)
replace D1 = D1 - 1
replace D1 = 0 if D1 <=0

gen disut_D1 = 0
replace disut_D1 = D1 *0.043

gen disut_total = disut_mo + disut_sc + disut_ua + disut_pd + disut_ad - disut_D1

gen EQ_index = . 
replace EQ_index = 1 - disut_total
replace EQ_index = 1 if mobility == 1 & selfcare == 1 & activity == 1 & pain == 1 & anxiety == 1 
replace EQ_index = round(EQ_index, .001)