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. Author manuscript; available in PMC: 2023 Apr 1.
Published in final edited form as: Environ Res. 2021 Dec 13;205:112551. doi: 10.1016/j.envres.2021.112551

Table 2.

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

Predictors
Crude Model 11 Model 1 1 Crude Model 2 2 Model 2 2
R2 0.0041 R2 0.0145 R2 0.0011 R2 0.0120
BLLs 3-5 years 0.04 [−0.02, 0.09] 3 0.03 [−0.02, 0.09]
BLLs 12 years - −0.04 [−0.16, 0.07] −0.04 [−0.16, 0.07]
Father Occupation
Unemployed −0.25 [−1.11, 0.62] −0.26 [−1.12, 0.60]
Unskilled/skilled −0.04 [−0.41, 0.33] −0.05 [−0.42, 0.31]
Professional Ref Ref
Mother Occupation
Unemployed 0.08 [−0.39, 0.55] 0.09 [−0.38, 0.57]
Unskilled/skilled −0.03 [−0.46, 0.40] −0.02 [−0.45, 0.41]
Professional Ref Ref
Age at HRV test −0.14 [−0.51, 0.23] −0.13 [−0.49, 0.23]
Sex
Female 0.09 [−0.21, 0.38] 0.07 [−0.23, 0.36]
Male Ref Ref
Serum Fe 0.15 [−0.02, 0.32] 0.16 [−0.02, 0.33]
Neighborhood
Crowded −0.03 [−0.32, 0.26] −0.02 [−0.30, 0.26]
Not Crowded Ref Ref
1

Model with BLLs at 3-5 years

2

Model with BLLs at 12 years

3

Coefficient [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.