Table 4.

Association of salivary testosterone with demographic and medical history variables in males.

Model	R2	Predictors	Beta	Sig	r2
Mixed effect model (selected variables)	0.32	Intercept	110.07
		Transferrina	17.36	<0.001	0.24
		Age since DOB	−5.84	0.08	0.02
		5 Min APGAR	−5.26	<0.001	0.08
Full mixed effect model	0.39	Intercept	183.68
		Transferrina	17.89	<0.001	0.23
		Age since DOB	−7.99	0.02	0.04
		NICU >24 h	−2.87	0.44	<0.01
		Birth weight	0.00	0.49	0.01
		Gestational age birth	−0.10	0.40	0.02
		Mat ethnicity		0.05
		White	−14.60		0.20
		Black	−12.56		0.12
		American Indian	−25.34		0.05
		Pat ethnicity		0.51
		White	2.99		<0.01
		Black	0.13		<0.01
		Mat education	−0.05	0.94	<0.01
		Pat education	−0.64	0.35	0.02
		Mat age	−0.24	0.55	<0.01
		Pat age	0.31	0.50	0.02
		Mat psych history	2.71	0.51	<0.01
		Pat psych history	−6.07	0.17	0.02
		Income		0.08
		High	3.85		0.02
		Middle	−0.71		<0.01
		Missing	7.78		<0.01
		5-Min APGAR	−7.57	<0.001	0.15
		Gestation number	−3.18	0.38	0.01
		C-section	−3.34	0.18	0.01
		Mat smoking	2.53	0.60	<0.01
Reduced mixed effect model in infants with transferrin <0.5 ng/dl	0.22	Intercept	105.03
		Age since DOB	−2.93	0.50	<0.01
		5-Min APGAR	−7.07	<0.001	0.22

^aLog(10)transferrin.