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

gen disut_mo = .
replace disut_mo = 0 if missing(disut_mo) & mobility == 1
replace disut_mo = 0.046 if missing(disut_mo) & mobility == 2
replace disut_mo = 0.058 if missing(disut_mo) & mobility == 3
replace disut_mo = 0.133 if missing(disut_mo) & mobility == 4
replace disut_mo = 0.251 if missing(disut_mo) & mobility == 5

gen disut_sc = .
replace disut_sc = 0 if missing(disut_sc) & selfcare == 1
replace disut_sc = 0.032 if missing(disut_sc) & selfcare == 2
replace disut_sc = 0.05 if missing(disut_sc) & selfcare == 3
replace disut_sc = 0.078 if missing(disut_sc) & selfcare == 4
replace disut_sc = 0.122 if missing(disut_sc) & selfcare == 5

gen disut_ua = .
replace disut_ua = 0 if missing(disut_ua) & activity == 1
replace disut_ua = 0.021 if missing(disut_ua) & activity == 2
replace disut_ua = 0.051 if missing(disut_ua) & activity == 3
replace disut_ua = 0.1 if missing(disut_ua) & activity == 4
replace disut_ua = 0.175 if missing(disut_ua) & activity == 5

gen disut_pd = .
replace disut_pd = 0 if missing(disut_pd) & pain == 1
replace disut_pd = 0.042 if missing(disut_pd) & pain == 2
replace disut_pd = 0.053 if missing(disut_pd) & pain == 3
replace disut_pd = 0.166 if missing(disut_pd) & pain == 4
replace disut_pd = 0.207 if missing(disut_pd) & pain == 5

gen disut_ad = .
replace disut_ad = 0 if missing(disut_ad) & anxiety == 1
replace disut_ad = 0.033 if missing(disut_ad) & anxiety == 2
replace disut_ad = 0.046 if missing(disut_ad) & anxiety == 3
replace disut_ad = 0.102 if missing(disut_ad) & anxiety == 4
replace disut_ad = 0.137 if missing(disut_ad) & anxiety == 5

gen disut_l45 = 0
replace disut_l45 = 0.078  if mobility >= 4 | selfcare >= 4 | activity >= 4 | pain >= 4 | anxiety >= 4

gen disut_total = disut_mo + disut_sc + disut_ua + disut_pd + disut_ad + disut_l45

gen EQ_index = . 
replace EQ_index = 1 - 0.096 - disut_total 
replace EQ_index = 1 if mobility == 1 & selfcare == 1 & activity == 1 & pain == 1 & anxiety == 1 
replace EQ_index = round(EQ_index, .001)