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From:
Published online 2012 December 4. doi: 10.1371/journal.pone.0051046

Table 1

Demographic and Clinical Characteristics of the DHS2 Stratified by Leukocyte Telomere Length Tertile.
First(Shortest)n = 1053Second(Middle)n = 1052Third(Longest)n = 1052P-valueP-value adjusted for covariates*
Telomere length (kb)4.14–6.026.02–6.536.53–9.20
Age (years)52.7±11.249.2±10.948.3±10.8<0.0001
Male (%)44.340.836.10.0001<0.0001
African American (%)52.950.352.00.67920.2961
European American (%)35.434.431.40.04920.6530
Hispanic (%)11.715.316.60.00130.0300
WBC count (×109/L)6.61±2.116.72±1.996.56±2.140.20380.6349
RBC count (×109/L)4.56±0.504.60±0.494.56±0.470.80870.0560
Hemoglobin (g/dL)13.8±1.713.7±1.713.5±1.6<0.00010.0009
MCV (fL)90.1±6.788.6±6.488.1±6.4<0.0001<0.0001
RDW (%)14.1±1.514.1±1.713.9±1.5<0.0001<0.0001
Platelet count (×109/L)245±69249±67259±67<0.00010.0016
Iron (µg/dL)88.7±35.388.3±40.086.8±36.10.20820.6722
Homocysteine8.94±3.388.83±3.488.81±4.880.00540.8474
BMI (kg/m2)31.0±7.231.3±7.431.5±7.70.19520.2195
Smoking (%)
Never50.055.757.30.00060.1020
Former23.523.521.20.23580.2150
Current26.520.721.50.00920.0027
Smoking (pack-years)20.7±18.718.1±17.617.1±15.80.01900.2665
Alcohol Drinkers (%)
Never8.58.09.80.27310.4650
Former21.921.520.30.39570.6795
Current69.670.469.90.71900.4162
Alcohol intake (g/day)0.30 (0–5.6)0.31 (0–5.6)0.21 (0–4.2)0.93870.5260
Quantitative variables are shown as mean ± SD or median (1st – 3rd quartile). P-values are based on the Jonckheere-Terpstra test for trend or linear regression for continuous variables, and chi-square tests for trend or logistic regression for qualitative variables. Includes current smokers only. Pack-years are calculated as (packs smoked per day) × (number of years as a smoker).
*Gender is adjusted for age only. Analyses of ethnicities are adjusted for age and gender. All other analyses are adjusted for age, gender and ethnicity.