Table 3. Feasibility and acceptability of real-time adherence monitor.

(N = 58, i.e. 19 in the daily SMS arm, 20 in the weekly SMS arm, 19 in the control arm)
Feasibility issue	Comments
Data loss*	342/9224 (3.7%) of data were lost because of technical issues with the adherence monitors.
Device malfunction*	2 (3%) out of 60 devices malfunctioned due to technical failures and were replaced.
Device battery changes* Taking pills from another source Reason(s) (n = 10) •Was traveling •Had not refilled the device Openings without pill removal (n = 8) •During refilling the monitor •Opened accidently	Study staff replaced 4 batteries; poor mobile network resulted in repeated attempts to transmit the data which depleted the batteries before the anticipated battery lives. 10 (18%) of TB patients reported ever taking pills from another source during the study period. 7 (70%) 3 (30%) 4 (50%) 4 (50%)
Acceptability
Perceived usefulness Perceived ease of use	58 (100%) of TB patients reported that the real-time monitor: a) was useful in their TB medication adherence; b) helped them take their medication in time/as prescribed; d) positively affected the way they felt about taking medicine; e) and made it easier for TB patients to take their medication. 58 (100%) of TB patients found the real-time monitor easy to open and close, and remember to get pills. 45 (78%) of TB patients found the real-time monitor easy to travel with.
Disclosure from the real-time monitor	3 (5%) of TB patients reported that the adherence monitor resulted in unwanted disclosure of their TB status

*Data about data loss, device malfunction, and battery changes were collected from Wisepill device. All other data were collected via patient questionnaires.