A:AS Level Mathematics B (MEI)
H630/02 Pure Mathematics and Statistics



A:A Level Mathematics B (MEI)
H640/02 Pure Mathematics and Statistics

A:Pre-release material
A:Large Data Set 9 - for issue in June 2024

A:This Large Data Set will be used for H630/02 in June 2026 and
 H640/02 in June 2027

A:1. Introduction
A:The Large Data Set (LDS) consists of data about individuals who took part in the American National Health and Nutrition Examination Survey (NHANES) in 2003-4. 
The data were downloaded on 27/03/17 from http://www.eeps.com/zoo/nhanes/source/choose.php   
Students can compare results from this sample with other samples from the same source. 
A larger sample has not been used to ensure that dealing with missing data and copying into other software is not too time consuming.

A:2. National Health and Nutrition Examination Survey (NHANES)
A:The National Health and Nutrition Examination Survey has been taking place since the 1960s in the United States.  It combines interview and physical examination to assess the health and nutritional status of adults and children in the United States.  More information about the survey can be found at http://www.cdc.gov/nchs/nhanes/about_nhanes.htm .
A:The survey examines a representative sample of 5 000 people each year.
A:The data in the Large Data Set is a subset of the information collected for a random sample of 200 individuals, aged 16 and over, from the 2003-4 NHANES survey.   
A:If a particular data value is not available, the code #N/A has been included in the Large Data Set – this is to prevent some software reading a blank as a zero.

A:Field | B:Further Information
A:Sex | B:Male or female
A:Age | B:Age in years
A:Marital | B:Marital status
A:Weight | B:Weight (kg)
A:Height | B:Height (cm)
A:BMI | B:Body mass index
A:ThighLen | B:Upper leg length (cm)
A:UpperArmLength | B:Upper arm length (cm)
A:Waist | B:Waist circumference (cm)
A:Food30 | B:Food in last 30 minutes
A:Arm | B:Which arm was used for blood pressure measurement.  Those measuring blood pressure (interviewers) were instructed to use the person’s right arm, unless it was not possible.
A:Pulse | B:Pulse rate, beats in 60 seconds
A:Systolic1 | B:Systolic blood pressure (first reading) (mm Hg)
B:The systolic blood pressure is the pressure at the time when the heart beats.
A:Diastolic1 | B:Diastolic blood pressure (first reading) (mm Hg)
B:The diastolic blood pressure is the pressure between heart beats.
A:Systolic2 | B:Interviewers are instructed to get three measurements of blood pressure (with at least one minute between readings).  This might take up to four attempts.  They are instructed not to take more than four attempts to get the blood pressure readings.
A:Diastolic2
A:Systolic3
A:Diastolic3
A:Systolic4
A:Diastolic4
A:Systolic | B:Systolic (average)
(The first reading is ignored when taking the average, unless there is only one reading.)
A:Diastolic | B:Diastolic (average)
(The first reading is ignored when taking the average, unless there is only one reading.)

A:Copyright: http://www.cdc.gov/nchs/nhanes/about_nhanes.htm (these data are in the public domain)