Document Type : Descriptive & Survey
Authors
1 Department of Community Medicine, School of Medicine, Aja University of Medical Sciences, Tehran, Iran
2 Department of Statistics, University of Kurdistan, Sanandaj
3 Department of Health Education and Promotion, School of Public Health, Bushehr University of Medical Sciences, Bushehr, Iran
Keywords
n is sample size, z=1.96, d=.05 is acceptable sample error and N=1400 is the population size. By putting this values in the formula, we can obtain n≃300 which is a conservative sample size for the research. Inclusion criteria were being retired, being familiar with the Internet, and having physical and mental health to answer the questions and the subjects who were not qualified were excluded from the study. 

