. 2015 May 5;15:51. doi: 10.1186/s12887-015-0368-x

Table 3.

Multiple linear regression analyses between ADHD scores and BLLs after adjusting for ADHD-related variables

Dependent variables ^a	Independent variables	Beta ^b	p
Model 1	R²	0.18
Inattentive score	Blood lead levels	0.225	0.001
	Age	–0.210	0.001
	Sex	–0.098	0.119
	Serum ferritin	–0.005	0.940
	Father’s work relating to e-waste	0.010	0.879
	E-waste workshops around the house	0.171	0.011
Model 2	R²	0.20
Hyperactive/Impulsive score	Blood lead levels	0.283	0.000
	Age	–0.148	0.020
	Sex	–0.176	0.005
	Serum ferritin	–0.035	0.579
	Father’s work relating to e-waste	–0.046	0.490
	E-waste workshops around the house	0.150	0.024
Model 3	R²	0.22
Total score^c	Blood lead levels	0.284	0.000
	Age	–0.198	0.002
	Sex	–0.154	0.012
	Serum ferritin	–0.022	0.715
	Father’s work relating to e-waste	–0.021	0.751
	E-waste workshops around the house	0.179	0.006

^aLog-transformed values.

^bStandardized coefficients.

^cTotal score: sum of inattentive and hyperactive/impulsive scores.