Codes and Frequencies
For sample adults in 2000 who had taken any vitamin C during at least 1 month of the past 12 months (VITAMINCMO), VITAMINCNO reports the number of days (per week or per month) that respondents had taken vitamin C in those months.
Interviewers asked, "During [the/those] month(s), about how many [days [per week]/days per month] did you take vitamin C?" VITAMINCNO must be interpreted in conjunction with VITAMINCTP, which reports the type of time unit ("days per week," "days per month," or "other") respondents used when answering the question.
The National Center for Health Statistics recoded data from VITAMINCNO and VITAMINCTP to create two new variables with consistent time units: Number of days per week took vitamin C during the relevant months of the past 12 months (VITAMINCDWK), and number of days per month took vitamin C during the relevant months of the past 12 months (VITAMINCDMO). VITAMINCDMO is also available for 1992, when it was asked as a direct question.
Variables similar to VITAMINCNO are available for the following vitamin/mineral supplements (with years indicating availability):
- Beta carotene (VITABETANO, 2005)
- Calcium (VITACALCNO, 2000, 2005)
- Vitamin A (VITAMINANO, 2000)
- Vitamin E (VITAMINENO, 2000, 2005)
- Multi-vitamins (VITAMULTVNO, 2000, 2005)
- Selenium (VITASELNNO, 2005)
For more information on the full range of variables related to vitamins, see VITANY.
- 2000: Sample adults age 18+ who took vitamin C in past 12 months.
- 2000 : SAMPWEIGHT