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Table 3 Estimated mean SBP (mm Hg) within each node produced from binary partitions from metals concentrations, adjusted for age, age2, race, sex, BMI, and smoking status; partitions can be linked to the SBP tree via lower case roman numerals (i-vii), and child nodes are classified as left (L) or right (R), relative to their position in the tree, for each partition

From: Metal biomarker mixtures and blood pressure in the United States: cross-sectional findings from the 1999-2006 National Health and Nutrition Examination Survey (NHANES)

Partition

Node

End Node

Splits

N

Mean SBP

NA

Root

No

NA

2413

119.05

i

L

No

Sb ≤ 0.21

2095

118.59

R

Yes

Sb > 0.21

318

122.08

ii

L

No

Cd ≤ 0.22

1047

117.34

R

No

Cd > 0.22

1048

119.74

iii

L

Yes

Cs ≤ 2.75

243

119.87

R

No

Cs > 2.75

804

116.53

iv

L

No

Pb ≤ 2.55

782

117.82

R

Yes

Pb > 2.55

266

125.83

v

L

Yes

W ≤ 0.07

432

115.56

R

Yes

W > 0.07

372

117.52

vi

L

No

W ≤ 0.09

536

119.59

R

Yes

W > 0.09

246

113.65

vii

L

Yes

Ba ≤1.23

292

119.50

R

Yes

Ba > 1.23

244

119.41

  1. SBP: systolic blood pressure, Ba: urinary barium (μg/g creatinine), Cd: urinary cadmium (μg/g creatinine), Cs: urinary cesium (μg/g creatinine), Pb: blood lead (μg/dL), Sb: urinary antimony (μg/g creatinine), W: urinary tungsten (μg/g creatinine).