IPUMS NHIS: descr: VITYVITAUN

IPUMS NHIS

NHIS
MEPS

NATIONAL HEALTH INTERVIEW SURVEY

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VITYVITAUN

Took vitamin A, past 12 months: Number of units per pill

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Description

For sample adults in 1987 who had taken vitamin or mineral supplements (VITANY) and vitamin A (VITAMINA) in the past 12 months, VITYVITAUN reports the number of international units of vitamin A in each pill taken by the respondent (VITYVITAPILS).

Definitions

Although the wording of the survey question associated with VITYVITAUN refers only to "units," the 1987 Field Representative's Manual suggests that "units" is intended to mean "international units" (IU).

[show more]

The Manual offers these instructions to interviewers:

When completing 3e, do not enter the % USRDA, RDA value or other weight on the "unit" line, just enter the number. For example, if vitamin A is listed as "5,000 IU-100% USRDA," enter "5,000" on the "unit" line. More than likely the respondent will need to refer to the container for this information. However, if the respondent does not know the number of units and does not volunteer to get the container, do not ask for it. ...

Question 3e asks for the number of units of Vitamin A in each pill. If the bottle says to take 2 pills to get 1,000 IU, enter 500 since that is the number of IUs in each pill.

International units are defined by the Office of Dietary Supplements at the National Institutes of Health as "a measurement used to measure the activity of some vitamins and other biological substances (such as enzymes and hormones)." (http://ods.od.nih.gov/factsheets/showterm.aspx?tID=296)

Related Variables[show more]

It is possible to use both VITYVITAUN and VITYVITAPILS to determine the number of IU of vitamin A respondents were taking, on days they took vitamin A. The related variables VITAMINAMO and VITAMINADMO report the frequency of respondents' use of vitamin A in number of months and number of days per month, respectively.

Analysts interested in the units of vitamin A taken may wish to consult the following variables, which report similar information for other vitamins/minerals (all only available for 1987). Users should note that vitamin E is also measured in international units (a measure of biological activity), but vitamin C and calcium are measured in milligrams (a measure of quantity). Further, a direct comparison of IU across substances is not possible. That is, 1,000 IU of vitamin A is not equivalent to 1,000 IU of vitamin E.

VITYVITCMG Vitamin C

VITYVITEUN Vitamin E

VITYCALCMG Calcium

For more information on the full range of variables related to vitamins and minerals, see VITANY.

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