“…Passive data collection via wearable technology, GPS, accelerometer/actigraph, Wi-Fi location, smartphone usage, and typing metadata Lower levels of physical activity were associated with increased levels of negative affect, depressive feelings, and anhedonia (e.g., reduced ability to enjoy pleasurable activities) | Two studies employing non-clinical samples and GPS-derived data found no significant associations between these variables (Chow et al [ 30 ]; Melcher et al) [ 128 ] | Social Functioning ( n = 21) | Active data collection via self-reported questionnaires, and passive data collection via smartphone embedded audio features, and phone call/SMS frequency | Increased levels of depression severity associated with preference for being alone, increased social distance, reduced closeness with other individuals, increased interpersonal stress, reduced speech duration, and reduced phone call and SMS frequency Depression severity showed an association with reliance on social expression such that higher reliance on social expression of feelings (i.e., anger) predicted a decrease in depression severity over time (Chue et al) [ 31 ] | Moukaddam et al [ 136 ] used a clinical sample and found no correlations between depression levels and social interaction (SMS and phone call length and frequency) |
Sleep Quality ( n = 16) | Assessment of sleep quality involved self-reported questionnaires, accelerometer inferences (e.g., total steps during bedtime), GPS-derived data, actigraphy, smartphone embedded light sensors (e.g., increased light exposure during bedtime), smartphone use (screen on/off), sound features (e.g., ambient silence), and heart rate (assessed via wearable technology) | Most studies detected associations in variability of sleep quality and depression severity. Specifically, studies observed depression scores to be positively correlated with delayed sleep phase, sleep disturbance during weeknights, poor sleep quality, sleep variability, insomnia, and increased exposure to light during bedtime (Ben-Zeev et al [ 12 ]; Di Matteo et al, [ 49 ]; Difrancesco et al, [ 52 ]; Elovainio et al, [ 56 ]; Hung et al, [ 88 ]; Kaufmann et al, [ 100 ]; Kim et al, [ 105 ]; Melcher et al,) [ 128 ] | Two studies (1 clinical and 1 non-clinical sample) did not find significant correlations between self-reports of sleep duration and depression (Difrancesco et al, [ 52 ]; Hamilton et al) [ 76 ]. Additionally, 2 studies using non-clinical samples found no significant associations in depression levels and sleep quality a... |
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