Table 3.

BLLs influence on the speaking phase HRV frequency measure (LF/HF)

Predictors
	Crude Model 11	Model 1 1 R2	Crude Model 2	Model 2 2
	R2 0.0122	0.0539	R2 0.0023	R2 0.0426
BLLs 3-5 years	0.06 [0.004, 0.12] 3	0.06 [0.01, 0.12]		-
BLLs 12 years		-	−0.06 [−0.19, 0.07]	−0.05 [−0.18, 0.08]
Father Occupation
Unemployed		0.25 [−0.48, 0.98]		0.22 [−0.51, 0.96]
Unskilled/skilled		−0.01 [−0.34, 0.33]		−0.03 [−0.36, 0.30]
Professional		Ref		Ref
Mother Occupation
Unemployed		0.23 [−0.17, 0.63]		0.25 [−0.15, 0.65]
Unskilled/skilled		−0.01 [−0.39, 0.37]		0.01 [−0.36, 0.39]
Professional		Ref		Ref
Age at HRV test		0.17 [−0.23, 0.56]		0.18 [−0.22, 0.58]
Sex
Female		0.49 [0.21, 0.77]		0.46 [0.18, 0.74]
Male		Ref		Ref
Serum Fe		0.11 [−0.05, 0.26]		0.13 [−0.03, 0.28]
Neighborhood
Crowded		0.15 [−0.14, 0.43]		0.17 [−0.11, 0.45]
Not Crowded		Ref		Ref

¹Model with BLLs at 3-5 years

²Model with BLLs at 12 years

³Coefficient [95% Confidence Interval]

Bolded= p-value < 0.05

Notes. Models represent the LF/HF outcome. An increasing LF/HF ratio indicates a decreasing HRV value.