Question

Choose an outside paper to present to the class that examines issues of validity of self-reported height and weight data within a specific sub-group. Summarize the methods and key findings, and discuss your assessment of the researcher’s decisions or conclusions. How can the findings of this paper be applied to future research to improve the validity of these measures? What special considerations related to the sub-group should researchers take into account? Here is a link to the article: https://docs.google.com/document/d/1HBSoVSkUOXXwMjxB6R258ThpLxlA7olT5Npp_DGjquY/edit?usp=sharing

Answer 1

What is validity?

validity is a measure or examination of what it claims to measure or examine.

what is validity of self reported data?

self reported data :-self reported data is in the form of poll, quetionnarie,or survey in which respondent select the response without the interference of the researcher.

Validity of self reported data:-when their is challenge to validity, their are research tools that can report the problem respondent bias in self reported data.

Introduction:- The self-reported data by the U. S teens reports the following :-

• Teens among the age group of 12-19 years mark the triple fold increase in obesity and overweight in last 30years.
• African-America adolescent females marked comparatively higher incidence of overweight and obesity.

To better understand the epidemiology of overweight and obesity, their is requirement of accurate data collection of height and weight ,BMI (body mass index) .

BMI:- Body Mass Index is a persons weight in kilograms and height in meter square .BMI is very important for systematic establishment of -

• Incidence and pattern's
• Identifying risk groups
• Monitoring outcomes
• Evaluating the effectiveness of prevention programs and intervention.

Methods:-

Research design -Here we study the difference between perdictive capacity of body weight and self perception of body weight, also the healthy lifestyle behavior among the African American female teens.

We carry out two different subanalysis -

1. Primary sub-analysis -- investigation of the dependability of self reported data as a surrogate for measured data.
2. Secondary sub-analysis --comparing measurement methods by weight category and describe these differences.

Sample :-parent study, N=310 essentially healthy African American female teens of age 14-18years were recruited from New Orleans, Louisiana using combination probability /nonprobability sample strategy.

Inclusion criteria-

• Ability to read English
• Enrollment in public high school
• Ability to provide assent and written consent from parent

Exclusion criteria -

• Self reported history of acute or chronic condition
• Use of medication that affect weight
• Body composition /physical activity
• Pregnancy in last 6months /currently breastfeeding

Approval obtained from school administrators, written consent form parents and assent from participants were obtained.

Instruments and measurements :-

1. Demographic - Quetionnaire where filled by participants without researcher interference.
2. weight , height and BMI- accuracy was obtained by using proper measuring and accurate tools for the measurement of weight and height. These indirectly enhanced the efficiency of BMI counting.

statistical analysis:-frequency and measure of variability were used to evaluate normal distribution ,accurate description summarization of study variables and calculate the incidence of BMI missclassification.

Result :-

demographic character :-

mean participant age was 15.94years(SD=1.2),mean grade was 10.3(SD=1.1).Averages for measured weight, height were (m=64.4,SD=12.2)and(m=160.5,SD=6.8)respectively.