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

At serve, a tennis player aims to hit the ball horizontally. What minimum speed is required for the ball to clear the 0.90 m high net about 15.0 m from the server if the ball is “

At what temperature would the average speed of helium atoms equal (a)the escape speed from Earth, 1.12 ´ 10 4  m/s, and (b) the escape speed from the Moon, 2.37´ 10 3  m/s? (See Ch

Briefly explain how the wavelength of monochromatic light is calculated using Newton's rings arrangement?

list of anekardhi shabdh with examples

A particle with charge q and mass m is shot with K.E ''k'' into the region between two plates.If magnetic field between plates is B.How large B must be if the particle is to miss c

Although conduction does occur in liquids and gases also, heat is transmitting in these media mostly by convection. In that phenomenon, the real motion of the material is responsib

practical applications of vectors in everyday life

lux; lx: The derived SI unit of illuminance equivalent to the illuminance generated by a luminous flux of 1 lm distributed consistently over an area of 1 m 2 ; therefore it ha

What is the stimulated emission? Define this term briefly. Stimulated emission: a. While photon interacts along with atom that is in the excited state E 2 , in that case de-