Table 4.

Mean planning and speaking HRV frequency measure (LF/HF) for children dependent on BLLs at age 3-5 years

Predictors
	HRV 11	HRV 1 1	HRV 2 2	HRV 2 2
	R2 0.0010	R2 0.0117	R2 0.0113	R2 0.0533
BLLs Dichotomized				-
> 5 mcg/dl	0.01 [−0.19, 0.41] 3	0.10 [−0.22, 0.41] 3	0.35 [0.06, 0.63]	0.36 [0.08, 0.65]
≤ 5 mcg/dl	Ref.	Ref.	Ref.	Ref.
Father Occupation
Unemployed		−0.25 [−1.12, 0.62]		0.27 [−0.47, 1.01]
Unskilled/skilled		−0.05 [−0.41, 0.32]		−0.01 [−0.34, 0.32]
Professional		Ref		Ref
Mother Occupation
Unemployed		0.09 [−0.38, 0.57]		0.23 [−0.16, 0.63]
Unskilled/skilled		−0.02 [−0.45, 0.41]		0.01 [−0.37, 0.38]
Professional		Ref		Ref
Age at HRV test		−0.12 [−0.48, 0.24]		0.20 [−0.19, 0.60]
Sex
Female		0.07 [−0.22, 0.37]		0.48 [0.20, 0.76]
Male		Ref		Ref
Serum Fe		0.16 [−0.02, 0.33]		0.15 [−0.03, 0.27]
Neighborhood
Crowded		−0.06 [−0.36, 0.24]		0.15 [−014, 0.43]
Not Crowded		Ref		Ref

¹Model with planning phase HRV LF/HF ratio

²Model with speaking phase HRV LF/HF ratio

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.