Refer to map to see articles that uses Text Messages as a signal. [[Article - Relapse prediction in schizophrenia with smartphone digital phenotyping during COVID-19 - a prospective, three-site, two-country, longitudinal study]] [[08-01-2024]] Inconsistencies Refer to [[Paper - Correlations between objective behavioural features collected from mobile and wearable devices and depressive mood symptoms in patients with affective disorders systematic review]] - "Some studies have shown similar results, while others have shown contradicting results. For example, Beiwinkel et al [[22](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6111148/#ref22)] found a statistically significant negative correlation between the number of outgoing SMS text messages and the HDRS, whereas Faurholt-Jepsen et al [[6](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6111148/#ref6)] found a statistically significant positive correlation. Asselberg et al [[15](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6111148/#ref15)] found a negative correlation with mobile phone usage frequency and depressive symptoms, while Saeb et al [[7](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6111148/#ref7)] found the opposite."