Reliability and validity

 

1. Describe the relationship between reliability and validity
2. Identify two specific tests for identifying the same health condition of your choice.
3. Which test from question 2, above has a higher specificity? Please explain.

 

Sample Solution

Reliability and Validity

Reliability refers to the degree to which scores from a particular test are consistent from one use of the test to the next. Ultimately then, validity is of paramount importance because it refers to the degree to which a resulting score can be used to make meaningful and useful inferences about the test taker. Reliability can be estimated by comparing different versions of the same measurement. Validity is harder to assess, but it can be estimated by comparing the results to other relevant data or theory. Methods of estimating reliability and validity are usually split up into different types. Validity and reliability are two important factors to consider when developing and testing any instrument for use in study. Attention to these considerations helps to insure the quality of your measurement and of the data collected.

children with a family history T2DM, MS, dyslipidemia, cardiovascular disease, hypertension and/or obesity.

NCEP/ATPIII definition for children 12-18 years: Individuals with ≥3 of the following are considered at risk for MS:
-Waist circumference ≥90th Percentile for age and sex
– HDL cholesterol ≤40 mg/dl,
-Triglycerides ≥110 mg/dl
– Fasting plasma glucose >110 mg/dl, and
-BP ≥90th percentile according to age and sex
Waist circumference percentiles for the Indian Population were published recently by Khadilkar et al (18). They have suggested a cut-off of 70th percentile for WC, to screen for Metabolic Syndrome in Indian children.

5. Nonalcoholic Fatty Liver Disease (NAFLD):
Nonalcoholic fatty liver disease (NAFLD) constitutes a spectrum of conditions, ranging from steatosis to nonalcoholic steatohepatitis (NASH) and cirrhosis, in the absence of excessive alcohol consumption. The prevalence of NAFLD is 34.2% in obese children & adolescents and the reported prevalence is highest in Asia (19).
Most children are asymptomatic, while some may complain of right upper quadrant pain or abdominal discomfort. NAFLD aggravates hepatic insulin resistance, thereby increasing the risk of developing T2DM.
The liver SAFETY (Screening ALT for Elevation in Today’s Youth) study was conducted to develop ALT thresholds and the cut-off of ALT >25 for boys and >22 for girls were suggested for screening NAFLD in children (20).

6. Polycystic Ovary Syndrome (PCOS):
Increased adiposity, especially abdominal, is associated with hyperandrogenemia and increased metabolic risk. The diagnosis of PCOS in an adolescent girl should be made based on the presence of clinical and/or biochemical evidence of hyperandrogenism (after exclusion of other pathologies) in the presence of persistent oligomenorrhea (21). Polycystic ovary morphology on ultrasound is not reliable to make a diagnosis in adolescents because multi-follicular ovaries are a feature of normal puberty that subsides with onset of regular menstrual cycles (22).

7. Psychiatric:
Results from several studies suggest a higher rate of depression among obese children than among children of normal weight. In addition to depression, anxiety and low-self esteem have also been fou

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