Table 3. Effective response ratio.

	1-6 mo (n=132)	6 mo-1 yr (n=108)	1-2 yr (n=96)	2-3 yr (n=65)
Effective response	104	74	54	47
Ineffective response	28	34	42	18
ER ratio	0.79	0.69	0.56	0.72

mo, month; yr, year; n, number of patients; ER ratio, number of patients with effective response/number of patients who were followed up during the study period.