Table 2.

Response rate of the 50 patients for each response group

	Cohort n = 150		Responders n = 69		Nonresponders n = 81
Parameter	Number	%	Number	%	Number	%	P value
Type of follow-up
Phone	50	33	40	58	10	12	<0.001
Mail	50	33	17	25	33	41
E-mail	50	33	12	17	38	47