Table 2 Measurements used in the study at the different assessment times

Pregnant, Resp., Card., mental disease

X

–

–

–

–

–

–

Demographics

–

–

X

–

–

–

–

Distal outcomes

PHQ-9

X

X

X

X

X

–

2,3

GAD-7

X

X

X

X

X

–

2,3

TICS

–

X

X

X

X

–

2,3

Proximal outcomes

MDMQ¹

–

–

–

–

–

X

1,3

Audio features

Voice commands

–

–

X²

X²

X²

X²

1,2

Breathing sounds

–

–

X²

X²

X²

X²

1,2

Conversational agent

Reaction time to chatbot messages

–

X

X

X

X

X

1,2

Therapeutic alliance

–

–

–

–

X

–

3

Qualitative feedback

Willingness continue using BEDDA

–

–

–

–

X

–

3

Willingness pay for BEDDA

–

–

–

–

X

–

3

Improvements suggestions

–

–

–

–

X

–

3

Breathing exercise Breeze

Location

–

–

–

–

–

X

3

Perceived breathing detection accuracy

–

–

–

–

–

X

3

Accelerometer

–

–

–

–

–

X²

1,2

Gyroscope

–

–

–

–

–

X²

1,2

Magnetometer

–

–

–

–

–

X²

1,2

Light sensor

–

–

–

–

–

X²

1,2

Ambient temperature sensor

–

–

–

–

–

X²

1,2

Humidity sensor

–

–

–

–

–

X²

1,2

Pressure sensor

–

–

–

–

–

X²

1,2

Step counts since start

–

–

–

–

–

X²

1,2

Proximity sensor

–

–

–

–

–

X²

1,2

Smartwatch groups

Physical activity

–

–

–

–

–

X³

1,2,3

Heart-rate

–

–

–

–

–

X³

1,2,3

Heart-rate variability

–

–

–

–

–

X³

1,2,3

Sleep duration, length of sleep phases

–

–

–

–

–

X³

1,2,3

Oxygen saturation

–

–

–

–

–

X³

1,2,3

Respiration rate

–

–

–

–

–

X³

1,2,3

Stress level

–

–

–

–

–

X³

1,2,3

Skin temperature

–

–

–

–

–

X³

1,2,3

Motion-based activity

–

–

–

–

–

X³

1,2,3

Steps

–

–

–

–

–

X³

1,2,3