Exact(7)
Seven hundred and twenty surveys were sent in each mailing and a total of 249 surveys were returned (34.6%).
Nonrespondents received an identical follow-up mailing at 3 weeks after the initial mailing and a follow-up reminder phone call at 6 weeks with the option to complete the questionnaire over the phone.
The process included a first survey mailing, a thank you/reminder postcard, a second survey mailing, and a final survey mailing accompanied with reminder phone calls to nonrespondents.
Several strategies were used to optimize response rate and included: personalized cover letters, coloured paper for surveys, stamped return envelopes, follow-up mailing, and a priority post mailing [ 51].
After two reminders were sent, 1 month and 2 months after the initial mailing, and a final telephone reminder, 4 months after the initial mailing, 178 completed questionnaires were received.
A postcard reminder was sent one week after the initial mailing and a full survey package was sent to non-respondents two weeks later, and again approximately 4 to 6 weeks from the initial mailing if no reply was received in-between.
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