... increase in reliability o n the other [19].Household income was calculated as the sum of the respondent’ s own earned income, earned income ofother persons living in the household, social securityincome, ... designed the study andmanaged the field work. HHK, DH, HM undertook the statistical analyses.HHK, TL, and SRH wrote the first draft of the manuscript. All authorscontributed to and have approved the ... considerably increased the model fit (R2= 0.31) on the one hand, wh ile independent variablesage and income became insignificant on the other.Thus, worse EQ-VAS scores for the older of theseelderly...