Fig. 4
The participation rate and dropout rate according to road distance. The participation rate in OCR (a) and dropout rate from OCR (b) according to the road distance from home to hospital in subgroups with cardiovascular diseases. The OCR participation rate and dropout rate according to road distance from patients’ homes to the hospital (< 10 km, 10–20 km, 20–30 km, and ≧ 30 km) were compared using the χ2 test to examine the participation rate and dropout rate as the distance increases by 10 km. The logistic analysis adjusted for confounding variables with a quadratic term of distance as a continuous variable was also performed. PCI, percutaneous coronary intervention; CABG, coronary artery bypass grafting; CHF, congestive heart failure