A cross sectional survey was carried out for the elderly who live in Boung yee Thoa municipality, Thunyaburi district, Pathumtanee province, during November 2010 through July 2011.
The elderly surveyed were categorized into three age groups: 60-69 years, 70-79 years, and 80 years and over
The sample size was calculated at 384 persons (plus 20% for possible attrition, was 460 cases) and sampling was by convenience method.