umx (version 1.4.0)

us_skinfold_data: Anthropometric data on twins

Description

A dataset containing height, weight, bmi, and skin-fold fat measures in several hundred US twin families participating in the MCV Cardiovascular Twin Study (PI Schieken)

Usage

data(us_skinfold_data)

Format

A data frame with 53940 rows and 10 variables

Details

• fan FamilyID (t1=male,t2=female)
• zyg Zygosity 1:mzm, 2:mzf, 3:dzm, 4:dzf, 5:dzo
• ht_T1 Height of twin 1 (cm)
• wt_T1 Weight of twin 1 (kg)
• bmi_T1 BMI of twin 1
• bml_T1 BMI of twin 1
• bic_T1 Biceps Skinfold of twin 1
• caf_T1 Calf Skinfold of twin 1
• ssc_T1 Subscapular SSkinfold of twin 1
• sil_T1 Suprailiacal Skinfold of twin 1
• tri_T1 Triceps Skinfold of twin 1
• ht_T2 Height of twin 2
• wt_T2 Weight of twin 2
• bmi_T2 BMI of twin 2
• bml_T2 BMI of twin 2
• bic_T2 Biceps Skinfold of twin 2
• caf_T2 Calf Skinfold of twin 2
• ssc_T2 Subscapular Skinfold of twin 2
• sil_T2 Suprailiacal Skinfold of twin 2
• tri_T2 Triceps Skinfold of twin 2

References

Moskowitz, W. B., Schwartz, P. F., & Schieken, R. M. (1999). Childhood passive smoking, race, and coronary artery disease risk: the MCV Twin Study. Medical College of Virginia. Archives of Pediatrics and Adolescent Medicine, 153, 446-453. http://www.ncbi.nlm.nih.gov/pubmed/10323623

Examples

data(us_skinfold_data)
str(us_skinfold_data)
par(mfrow = c(1, 2))  # 1 rows and 3 columns
plot(ht_T1 ~ht_T2, ylim = c(130, 165), data = subset(us_skinfold_data, zyg == 1))
plot(ht_T1 ~ht_T2, ylim = c(130, 165), data = subset(us_skinfold_data, zyg == 3))
par(mfrow = c(1, 1))  # back to as it was