cig2019 | R Documentation |
The National Health Interview Survey (NHIS), conducted by the National Center for Health Statistics and the U.S. Census Bureau, is a large, annual, cross-sectional survey designed to measure health status and behaviors in the non-institutionalized U.S. population. This dataset, which was extracted from the 2019 NHIS, includes responses to several questions pertaining to cigarettes. Adult participants (age 18+) were asked, “Have you smoked at least 100 cigarettes in your entire life?” Those who answered “Yes” were asked additional questions about current use; for those who did not, the interviewers skipped to the next section.
Analyses of NHIS data should account for the stratified multistage cluster sample design. Sample weights, stratum and cluster indicators are included for this purpose.
cig2019
a data frame with 31,997 rows and 14 variables:
wtia_a
interim annual weight for analysis of adult questionnaire items; see NOTE below
wtfa_a
final annual weight for analysis of adult questionnaire items; see NOTE below
urbrrl
urban/rural classification scheme for
counties, a factor with levels "Large central metro"
,
"Large fringe metro"
, "Med/small metro"
. and
"Nonmetropolitan"
region
region within the United States, a factor
with levels "Northeast"
, "Midwest"
, "South"
,
and "West"
pstrat
pseudo-stratum for variance estimation
ppsu
pseudo-primary sampling unit for variance estimation; see NOTE below
agep_a
age in years; see NOTE below
sex_a
sex, a factor with levels "Male"
and
"Female"
hispall_p
single and multiple race groups with
Hispanic origin, a factor with levels "Hispanic"
, "NH
White only"
, "NH Black/AfrAmer only"
, "NH Asian
only"
, "NH AIAN only"
, "NH AIAN and other group"
,
and "Other single and multiple races"
smkev_a
“Have you smoked at least 100 cigarettes in
your ENTIRE LIFE?”, a factor with levels "Yes"
and
"No"
smknow_a
“Do you NOW smoke cigarettes every day,
some days or not at all?”, a factor with levels "Every
day"
, "Some days"
, and "Not at all"
; see NOTE below
cignow_a
“On average, about how many cigarettes do you NOW smoke a day?”; see NOTE below
smk30d_a
“On how many of the PAST 30 DAYS did you smoke a cigarette?”; see NOTE below
cig30d_a
“On average, when you smoked during the PAST 30 DAYS, about how many cigarettes did you smoke a day?”; see NOTE below
The weight variables wtia_a
and wtfa_a
both reflect the
probability that the person was selected into the sample. The
interim annual adult weight wtia
includes adjustments for
nonresponse due to non-participation in the interview. The final
annual adult weight wtia
includes adjustments for nonresponse
and additional factors to calibrate the sample to population totals
for important geographic and demographic variables.
The cluster identifier ppsu
is nested within the stratum
identifier pstrat
; for example, ppsu == 1
in
pstrat == 100
and ppsu == 1
in pstrat == 101
represent different clusters.
The age variable agep_a
is top-coded at 85; the value
agep_a == 85
indicates 85 or older.
Question smknow_a
, “Do you NOW smoke cigarettes every day,
some days, or not at all?”, was asked only if smkev_a =="Yes"
;
otherwise it is missing.
Question cignow_a
, “On average, about how many cigarettes
do you NOW smoke a day?”, was asked only if smknow_a == "Every
day"
; otherwise it is missing. This variable is top-coded at 95
.
Question smk30d_a
, “On how many of the PAST 30 DAYS did
you smoke a cigarette?”, was asked only if smknow_a == "Some
days"
; otherwise it is missing.
Question cig30d_a
, “On average, when you smoked during the
PAST 30 DAYS, about how many cigarettes did you smoke a day?”, was
asked only if smknow_a == "Some days"
and if
(smk30d_a > 0) | is.na(smk30d_a)
. This variable is top-coded at
95
.
National Center for Health Statistics. National Health Interview Survey, 2019. Public-use data file and documentation. https://www.cdc.gov/nchs/nhis/data-questionnaires-documentation.htm. 2020.
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