TABLE 1.

Attrition

Step	Description	Patients, n (%)
1	Total patients in the IBD Partners cohort (as of June 30, 2019)	16,441
2	Patients having completed the clinical trial questionnaire at any visit	16,079 (97.8%)
3	Patients reporting either CD or UC diagnosis	15,662 (97.4%)
4	Patients reporting residence in the United States	14,747 (94.2%)
4a	Patients ever having reported taken or currently taking a clinical trial medication	1119 (7.6%)
4b	Patients never having reported taken or currently taking a clinical trial medication	13,628 (92.4%)