fugue (version 0.1.7)

nh1and3: Smoking Matched Sets with 1 or 3 Controls

Description

Data from NHANES 2005-2006 concerning homocysteine levels in daily smokers (z=1) and never smokers (z=0), aged 20 and older.

Usage

data("nh1and3")

Format

A data frame with 1370 observations consisting of 353 matched pairs and 166 matched sets with 3 controls.

SEQN

NHANES ID number

z

=1 for a daily smoker, =0 for a never smoker

mset

Matched set indicator, for 519 sets, 1, 2, ..., 519

homocysteine

Blood homocysteine level

cigsperday30

Cigarettes smoked per day

cotinine

Cotinine is a biomarker for exposure to nicotine

female

=1 for female, =0 for male

age

Age in years

black

=1 for black, =0 for other

education

NHANES 1-5 score. 3 is a high school degree.

povertyr

Ratio of family income to the poverty level, capped at 5.

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.

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. <doi.org/10.1080/01621459.2015.1076342>

Examples

# NOT RUN {
data(nh1and3)
attach(nh1and3)
table(table(nh1and3$mset))
par(mfrow=c(1,2))
boxplot(homocysteine[1:166]~z[1:166],ylim=c(0,70),main="1-1 match",
  ylab="homocysteine",names=c("Control","Smoker"))
boxplot(homocysteine[167:1370]~z[167:1370],ylim=c(0,70),
  main="1-3 match",ylab="homocysteine",names=c("Control","Smoke"))
detach(nh1and3)
# }