Table 3.

Regression parameters (βs & 95% confidence intervals) for models examining the effects of sex and birth weight on symptoms of inattention

	Model 1	Model 2	Model 3	Model 4	Model 5	Model 6
	Familial	Tobacco	Parental Age	Medical Problems	Ext Comorbidity	Int Comorbidity
Sex	-.27 (-.34, -.20)	-.29 (-.35, -.23)	-.27 (-.34, -.21)	-.27 (-.34, -.20)	-.21 (-.27, -.16)	-.27 (-.33, -.22)
Linear birth weight	-.46 (-.65, -.26)	-.43 (-.62, -.23)	-.43 (-.64, -.23)	-.48 (-.68, -.29)	-.26 (-.46, -.07)	-.37 (-.57, -.18)
Linear interaction	.34 (.13, .55)	.32 (.12, .52)	.32 (.11, .53)	.36 (.15, .58)	.19 (-.01, .38)	.28 (.08, .48)
Quadratic birth weight	.15 (-.05, .34)	---	---	---	---	---
Quadratic interaction	-.08 (-.29, .14)	---	---	---	---	---

Note: bold font indicates p<.05; All models included child age, ethnicity, and family income as covariates; Model 1 was the primary analysis and included parental ADHD diagnosis as a covariate; Model 2 included prenatal tobacco exposure as a covariate; Model 3 included maternal and paternal age at birth as a covariate; Model 4 included prenatal, labor and delivery, and perinatal medical problems as covariates; Model 5 included child symptoms of ODD and CD as covariates; Model 6 included child diagnoses of depression, anxiety, and learning disorder as covariates; Quadratic birth weight and the quadratic interaction were not included in models 2-5 as these terms were not significant in the primary analysis.