(A) Geriatric Medicine Research, Dalhousie University, Halifax, Canada. Canadian Study on Health & Aging, Revised 2008. Version 1.2. Adapted from Rockwood et al⁶⁵  with permission. Permission granted to copy for research and educational purposes only. (B) Adapted from Saliba et al⁶⁴  with permission. (C) Adapted from Martinez-Tapia et al⁶⁶  with permission.