• B E Fries, S E Simon, J N Morris, C Flodstrom, and F L Bookstein.
• Institute of Gerontology and School of Public Health, University of Michigan, and Ann Arbor VA Medical Center, 48109-2007, USA. bfries@umich.edu
• Gerontologist. 2001 Apr 1; 41 (2): 173-9.

PurposeThe aim of this study was to validate a pain scale for the Minimum Data Set (MDS) assessment instrument and examine prevalence of pain in major nursing home subpopulations, including type of admission and cognitive status.Design And MethodsThis study considered validation of the MDS pain items and derivation of scale performed against the Visual Analogue Scale (VAS), using Automatic Interaction Detection. The derivation data describe 95 postacute care nursing home patients who are able to communicate. The scale is then used in retrospective analysis of 34,675 Michigan nursing home residents.ResultsA four-group scale was highly predictive of VAS pain scores (variance explanation 56%) and therefore quite valid in detecting pain. In the prevalence sample, only 47% of postacute patients compared to 63% of postadmission patients reported no pain, and these percentages rose with increasing cognitive impairment.ImplicationsPain is prevalent in nursing home residents, especially in those with cognitive dysfunction, and often untreated.

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