1. 1) 2008 year, aged population statistics. Korean National Statistical Office, 2009.
2. 2) Kim MH: A study on the factors which influence the successful aging among Korean elderly groups. Journal of the Korean Data Analysis Society, 2010, 12: 697-716.
3. 3) Paik JE: The relationships of life support and death anxiety for elderly. Journal of the Korean Data Analysis Society, 2010, 12: 3117-3136.
4. 4) Brown M, Sinacore DR, Host HH: The relationship of strength to function in the older adult. J Gerontol, 1995, 50: 55-59.
5. 5) Lee AS, Yoon CK: Risk factor of falls in hospital for the elderly. Journal of the Korean Data Analysis Society, 2010, 12: 2511-2524.