Explain study design, sampling strategy of variable, Physics

1. Brief definitions of the study design, sampling strategy, and outcome variable(s)

Study design: cross sectional study is carried out at just one point in time or over a short period of time. It provides estimates of the features of a community at just one point in time and they are suitable for measuring prevalence. A cross-sectional survey conducted during June-August 2009 in South East Qld.

Sampling strategy: random sampling defines when the required number of individuals selected at a random from the sampling frame, a list or a database of all individuals in the population. In this study sample included random selection of healthy men and women aged 50-85 years; subject were free from any condition likely to impact on Vitamin D status or calcium/bone metabolism (potential comorbidities). In this study, a number of 789 had completed a self-administered questionnaire (including self-reported typical sun exposure), a 14-day food diary and provided a fasting blood plasma sample to assess 25-hydroxyvitamin D [25(OH) D].

Outcome variables: Outcome variables are usually the dependent variables. These values usually presented as means or frequencies/percentages by group (e.g., Prevalence of individuals with vitamin D insufficiency) and are often the content of cells in tables and on the Y-axis of graphs. In this study the outcome variable is vitamin D status which was assessed by measuring 25 hydroxyvitamin D [25 (OH) D] concentrations in fasting EDTA -plasma, measured in nmol/L. Vitamin D insufficiency was considered as a serum 25 (OH) D <50nmol/L.

 

Posted Date: 4/6/2013 5:30:30 AM | Location : United States







Related Discussions:- Explain study design, sampling strategy of variable, Assignment Help, Ask Question on Explain study design, sampling strategy of variable, Get Answer, Expert's Help, Explain study design, sampling strategy of variable Discussions

Write discussion on Explain study design, sampling strategy of variable
Your posts are moderated
Related Questions
Pitch: It is the characteristics of a sound by which we can distinguish among a grave and shrill sound is known as pitch. It depends on frequency of the vibrating body and expr


Are end fitting standard? No, end fitting are not standard. Each system manufacturer favors a type of termination for his fibers along with threads, pressure glands, rivets or

kelvin; K (after Lord Kelvin, 1824-1907): The basic SI unit of thermodynamic temperature explained as 1/273.16 of the thermodynamic temperature of the triple point of water.

When Temperature increases,intensity increases,but in some time intensity decreases,Why?



Define Entropy of Ideal Gas? A vessel of volume V 1 contains N molecules of an ideal gas held at temperature T and pressure P 1. The energy of a molecule may be written in t

Q.   What is Einstein's photoelectric equation? Explain the laws of photoelectric effect with the help of this equation. Photoelectric Effect : The emission of electron from

A step-up transformer has a primary coil having of 152 turns and a secondary coil with 3040 turns. The primary coil receives a peak voltage of 98 V. a. What is the effectiv