Since 1971, the National Center for Health Statistics had been assessing the health and nutritional status of both children and adults in the United
... [Show More] States, through periodic National Health and Nutritional Examination Survey (NHANES) surveys. These surveys are an invaluable resource to epidemiological and public health research; the surveys can be used to determine the prevalence of major diseases and risk factors, to assess nutrition and health promotion, and to guide public health policy.
All initial and peer postings should be at least 250-500 words in APA format supported by scholarly sources.
In 2012, the NHANES National Youth Fitness Survey (NNYFS) was conducted in conjunction with NHANES to obtain physical activity and fitness levels of U.S. youths aged 3 through 15. Initial data from the NNYFS were released in 2013 and serve as the basis for this discussion problem.
Begin by downloading the Excel fileMHA610_Week 6_Discussion_NNYFS_workingdata.xls. This workbook was created by merging two datasets from the NNYFS:the demographic variables dataset, andthe body measures dataset. For the purposes of this discussion, many variables were eliminated from the original datasets, as well as observations with missing data on height and weight. The Excel workbook thus consists of one worksheet, with 1576 rows (the first row contains headers, and the next 1575 rows are observed values for the participants), and 11 columns of variables. The columns in the Excel file are the following:
SEQN
the respondent sequence number (index for all the files)
RIAGENDR
gender of the participant, 1 = male, 2 = female
RIDRETH1
race/Hispanic origin:
1 = Mexican American
2 = other Hispanic
3 = non-Hispanic white
4 = non-Hispanic black
5 = other
RIDEXAGY
age in years at time of physical exam
INDHHIN2
annual household income, categorized
INDFMIN2
annual family income, categorized
INDFMPIR
ratio of family income to poverty, 0 to 5
BMXWT
weight, in kg
BMXHT
height, in cm
BMXBMI
body mass index (kg/m^2)
BMDBMICBMI category:
1 = underweight
2 = normal weight
3 = overweight
4 = obese
. = missing
For purposes of this discussion, you are asked to answer the three following questions:
Does BMI vary significantly between boys and girls?
Does BMI vary significantly among the racial/ethnic groups?
Is there any trend to BMI with age? [Show Less]