Ultrasound completion
Six months after the initial outreach, 27.6% (95% CI: 19.5–35.7) completed an abdominal ultrasound in the Usual care arm, 54.5% (95% CI: 47.9–61.0) completed an abdominal ultrasound in the Letter + Order arm, and 54.1% (95% CI: 47.5–60.6) completed an abdominal ultrasound in the Letter + Order + Incentive arm. There was a significant increase in the ultrasound response rate in the Letter + Order arm compared to the Usual care arm (absolute difference of 26.9%; 95% CI: 16.5–37.3; Proportion of patients completing abdominal ultrasound in the 6-month period
