On Track and Break Free: Study staff conducted a 2-week test, during which they wore AutoSense for an average of 12 hours/day and simulated smoking multiple times per day. Study staff should have received up to 12 EMAs (4 random, 4 smoking, and 4 stress) per day. However, they received an average of only 3 EMAs per day. Low EMA/day average suggests that EMAs might not be triggered by simulated smoking and/or stress.
Time2Quit pilot study: Six participants wore AutoSense for 14 days. Participants should have received up to 12 EMIs per day. However, participants only received an average of 2 EMIs (see table).
Time2Quit pilot study: Six participants wore AutoSense during a 4-day pre-quit monitoring period when participants continued to smoke. Only 1 smoking-triggered EMA was recorded during this time of active smoking.
This reporting applied for both the newer MSHRV sensors (using MotionSense firmware), as well as with the older MotionSense sensors that have been deployed in the active user studies for some time.
Sensor versioning: This discussion also led to a conversation regarding puffMarker – implementation of puffMarker may need to be revised based on differing hardware/firmware profiles, e.g., different orientation of the IMU and different sampling rates. Nazir and Monowar, your expertise will likely be needed to evaluate this implementation question.