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

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

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).