Two stage random digit dialing procedures as developed by Mitofsky and elaborated by Waksberg are widely used in telephone sampling of the U.S. household population. Current alternative approaches have, relative to this procedure, coverage and cost deficiencies. These deficiencies are addressed through telephone sample designs which use listed number information to improve the cost-efficiency o...

Background: Discharge with personal consent is considered as one of the main problems in hospitalization condition since many patients leave the hospital prematurely against the doctor’s advice. Thus, the aim of this study was to identify the factors affecting the discharge with personal satisfaction in selected teaching hospitals of Tehran University of Medical Sciences. Methods: The pr...

BACKGROUND while low response rates need not introduce bias into research, having a lower percentage of responders does increase the potential for this to occur. This is of particular concern given the decline that has been occurring in response rates since the 1950s. However, there are various methods that can be incorporated into the study design, which can assist in increasing levels of part...

objective: in comparison to clinical oral health indices, perceived oral health measures are less applied in large-scale epidemiological oral health studies in iran. the aim of this study was to measure perceived oral health among adults in tehran, iran. methods: in this cross-sectional study, perceived oral health was measured in 1100 adults in tehran by two measures: 1- non-replaced extracted...