Table 2.

Task summary (mean, SD unless noted otherwise).

Task	Duration in seconds	Button clicks	Utterances	User errors (error rate)a	Chatbot errors (error rate)b
1. Find the list of current medications.c	46.1 (25.4)	1 (0)	0 (0)	0	0
2. Find 2 of the side effects of Amlodipine.c	69.1 (25.3)	3 (1)	1 (1)	0	0
3. Add 10 mg of Lisinopril every day at noon to your medication list.d	131.6 (84.1)	2 (1)	3 (1)	1 (10%)e	4 (12.9%)f
4. Update your medication reminder schedule for Amlodipine to remind you to take it on weekends at 10 am.d	120.7 (52.6)	4 (1)	2 (1)	1 (10%)g	1 (4.5%)f
5. View how many refills are left and the date of your next refill for Amlodipine.c	60.8 (36.1)	1 (1)	1 (1)	0	0
6. Find your blood pressure values for the month of August 2020.c	54.1 (20.8)	3 (3)	1 (1)	0	0
7. Add a blood pressure measurement of 120/80 that was taken on September 1, 2020.d	100.1 (66.8)	2 (1)	3 (1)	0	6 (23.1%)f,h
8. Share your blood pressure measurements for the month of August 2020 with Dr. Smith.d	69.3 (29.6)	4 (1)	1 (1)	0	0
9. Schedule an appointment with Dr. Smith for Tuesday, November 17th at 1 pm.d	43.8 (24.1)	4 (2)	1 (1)	0	0
10. Find a healthy dinner recipe.c	60.2 (28.8)	2 (1)	1 (1)	0	0
Total (mean, SD)	75.6 (51.5)	2.5 (1.7)	1.3 (1.2)	2 (2.0%)a	11 (8.6%)b

^aUser error rate was calculated per task by: number of participants who did not successfully complete the task/total number of participants.

^bChatbot error rate was calculated per task by: number of unrecognized utterances/total number of utterances.

^cData retrieval task.

^dData entry task.

^eType of user error: did not confirm medication was added.

^fType of unrecognized error: date/time format.

^gType of user error: inputted incorrect medication.

^hType of unrecognized error: blood pressure format.