A method for achieving high response rates in national surveys of U.S. primary care physicians
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.