Figure 3.

Quality-adjusted life-years (QALY) in each quarter in users of the self-care management system. The 1-year survival curve was divided into 3-month intervals and the bars were approximated using the survival rates at each of 60, 90, 180, and 365 days. The New York Heart Association (NYHA) class and the corresponding scores for quality of life in each 3 months were then determined as follows: 0.82 in NYHA class 1; 0.78 in NYHA class 2; 0.65 in NYHA class 3; 0.58 in NYHA class 4; and 0 in death. QALY was calculated in each 3 months as a utility value times 0.25 as the number of years (3 months/1 year) and summed up around 1 year.