A retrospective cohort study examined a demographically representative
sample from a Washington State integrated health system.
Health plan members aged 65 or older, including 2,095 EnhanceFitness
users, 13,576 Silver Sneakers users, and 55,127 nonusers
from 2005 through 2011, were classified as consistent users (used
a program ≥2 times in all years they were enrolled in the health
plan during the study period); intermittent users (used a program
≥2 times in 1 or more years enrolled but not all years), or nonusers
of EnhanceFitness or Silver Sneakers. The main outcome
was measured as time-to-first-fall requiring inpatient or out-ofhospital
medical treatment based on the International Classification
of Diseases, 9th Revision, Clinical Modification, Sixth Edition
and E-codes.