Table 3.

Difference in the response rate of each response group

	Cohort n = 150		Phone n = 50		Mail n = 50		E-mail n = 50
Parameter	Number	%	Number	%	Number	%	Number	%
Responder
Yes	69	46	40	80	17	34	12	24
No	81	54	10	20	33	66	38	76