A formula for calculating 30-item Geriatric Depression Scale (GDS-30) scores from the 15-item version (GDS-15)
Y. Zhang, M. Hoozemans, M. Pijnappels, S. M. Bruijn
The paper develops a formula to convert GDS-15 scores to GDS-30 scores using a dataset of older adults, finding that multiplying by 2 is inaccurate and providing an alternative formula with higher explained variance.
bioRxiv · Sep 22, 2022Bioengineering