Fig. 1From: Does the use of telephone reminders to increase survey response rates affect outcome estimates? An ancillary analysis of a prospective cohort study of patients with low back painFlowchart of patient participation and data collection. NOTE: 812 patients with low back pain referred from general practice to the regional Spine Centre at Silkeborg Regional Hospital in Denmark were included in the study. Six hundred forty-three responded without needing a telephone reminder and 52 responded after receiving a telephone reminderBack to article page