Table 1.
Response rates by survey and specialty.
Table 2.
Comparison of respondents and non-respondents.
Fig 1.
Internet vs. mail group response rates by survey (all specialties combines).
Internet group received up to 9 emailed invitations/reminders and up to 2 mailed invitations/reminders. Mail group received up to 4 mailed invitations/reminders. Internet group had higher response rate than mail group with p<0.0001.
Fig 2.
Internet vs. mail group average response rate by day (All specialties and surveys combined).
In five survey studies, an additional hand-addressed envelope was sent to the internet group (average n = 259). In six survey studies an additional hand-addressed envelope was sent to the mail group (average n = 162).
Fig 3.
Decline in average response rates by the number of surveys administered.
FM networks were invited to participate in the greatest number of surveys; whereas GIM networks were invited to participate in the least number of surveys.