nh0506: Smoking and homocysteine levels in NHANES 2005-2006.
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nh0506

R Documentation

Smoking and homocysteine levels in NHANES 2005-2006.

Description

Bazzano et al. (2003) noted higher homocysteine levels in smokers than in nonsmokers. See also Pimentel et al. (2016) for a related analysis.

Usage

data("nh0506")

Format

A data frame with 2475 observations on the following 32 variables.

Row: a numeric vector
SEQN: NHANES id number
female: 1 if female, 0 if male
age: age in years, >=20
black: 1 if black, 0 otherwise
hispanic: 1 if hispanic, 0 otherwise
education: Education
povertyr: Ratio of family income to the poverty level, capped at 5x
creactiveprotein: creactive protein
homocysteine: homocysteine
cotinine: cotinine in blood
cadmium: cadmium in blood
lead: lead in blood
bmi: Body mass index
cigs100life: 1 if smoked more than 100 cigarettes in lifetime, 0 otherwise
smokenow: 1 if smokes now, 0 otherwise
cigsdays30: Days smoked in last 30 days: 0 if never smoker, 30 if daily smoker
cigsperday30: Cigarettes smoked per day in last 30 days
tobacco5days: 1 = used tobacco in the last 30 days, 0 otherwise
dailysmoker: 1 = daily smoker, 0 = never smoker
neversmoker: 1 = never smoker, 0 = daily smoker
z: 1 if daily smoker, 0 if never smoker
propens: Estimated propensity score. The score was formed by logit regression of z on female, age, education, black, hispanic, povertyr, and bmi.
pstrat: Propensity score strata: (0,0.0733] (0.0733,0.131] (0.131,0.204] (0.204,0.33] (0.33,1]
age3: Age in 3 categories
ed3: Education in 3 categories
bmi3: BMI in 3 categories
pov2: Income above 2 times poverty, TRUE or FALSE
stf: A factor defining strata using female, age3, ed3, bmi3 pov2.
st: A numeric version of stf
stfp: A factor defining strata using stf and pstrat
stp: A numeric version of stp

Details

Data from NHANES 2005-2006 concerning homocysteine levels in daily smokers (z=1) and never smokers (z=0), aged 20 and older. Daily smokers smoked every day for the last 30 days, smoking an average of at least 10 cigarettes per day. Never smokers smoked fewer than 100 cigarettes in their lives, do not smoke now, and had no tobacco use in the previous 5 days.

Source

NHANES, the US National Health and Nutrition Examination Survey, 2005-2006.

References

Bazzano, L. A., He, J., Muntner, P., Vupputuri, S. and Whelton, P. K. (2003) Relationship between cigarette smoking and novel risk factors for cardiovascular disease in the United States. Annals of Internal Medicine, 138, 891-897.

Pimentel, S. D., Small, D. S. and Rosenbaum, P. R. (2016) Constructed second control groups and attenuation of unmeasured biases. Journal of the American Statistical Association, 111, 1157-1167.