Part A. Standard definitions
General formula				Definitions
		Taking per questionnaire		• Sensitivity: [A/(A+C)] x 100 • Specificity: [D/(B+D)] x 100 • Positive predictive value: [A/(A+B)] x 100 • Negative predictive value: [D/C+D)] x 100 • Accuracy: [(A+D)/(A+B+C+D)] x 100
		Yes	No
Taking per electronic health record (EHR)	Yes	A	B
	No	C	D

Part B. Raw data used to calculate results
Aspirin					Esomeprazole
		Taking per questionnaire					Taking per questionnaire
		Yes	No	Total			Yes	No	Total
Taking per EHR	Yes	137	18	155	Taking per EHR	Yes	7	2	9
	No	36	259	295		No	1	440	441
	Total	173	277	450		Total	8	442	450
Ibuprofen					Lansoprazole
		Taking per questionnaire					Taking per questionnaire
		Yes	No	Total			Yes	No	Total
Taking per EHR	Yes	9	4	13	Taking per EHR	Yes	4	1	5
	No	46	391	437		No	1	444	445
	Total	55	395	450		Total	5	445	450
Naproxen					Omeprazole
		Taking per questionnaire					Taking per questionnaire
		Yes	No	Total			Yes	No	Total
Taking per EHR	Yes	1	0	1	Taking per EHR	Yes	67	31	98
	No	13	436	449		No	17	335	352
	Total	14	436	450		Total	84	366	450