A colleague on ResearchGate commented “By comparing the screenings done at different times/intervals you can determine what changes have/ have not occurred”.

This is a useful article on clinical significance and depression: Jessica A. Keith , Helen Verdeli & Eleni Vousoura (2011) Evaluating the Clinical Significance of Depression Treatment, International Journal of Mental Health, 40:3, 3-28; DOI: http://dx.doi.org/10.2753/IMH0020-7411400301

Alessandra Merizzi

good question; unfortunately, the paper you quoted isn't open access

Quinten, C., Kenis, C., Decoster, L., Debruyne, P. R., De Groof, I., Focan, C., Cornelis, F., Verschaeve, V., Bachmann, C., Bron, D., Luce, S., Debugne, G., Van den Bulck, H., Goeminne, J. C., Baitar, A., Geboers, K., Petit, B., Langenaeken, C., Van Rijswijk, R., Specenier, P., … Wildiers, H. (2019). Determining clinically important differences in health-related quality of life in older patients with cancer undergoing chemotherapy or surgery. Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation, 28(3), 663–676. https://doi.org/10.1007/s11136-018-2062-6

refers to 15 items GDS [both fro improvement / deterioration]

regards, Mauro

https://www.sralab.org/rehabilitation-measures/geriatric-depression-scale#alzheimers-disease-and-progressive-dementia

Temitope Olaniwun

Shirley Ryan Abilitylab repository is indeed a "gold mine", even if according to the link last updating goes back to April 2013; yet, I couldn't find clinically meaningful pre-post score differences

regards, Mauro

In clinical studies evaluating antidepressants, response is often defined by a 50% decrease in the initial score, and remission by a score below the threshold defining the depressive state, i.e. 10/30 for the GDS