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Table 2 Linear regression models of associations between early life socioeconomic status and adult mammographic density, EDMD Study

From: Early life socioeconomic environment and mammographic breast density

  Model 1: Adjusted for age at mammogram & adult BMI Model 2: adjusted, for age at mammogram, adult BMI and early life factors (PTS, birthweight, weight at age 4) Model 3:adjusted for age at mammogram, adult BMI, early life factors and adult SES (adult education & income)
β (95% CI) β (95% CI) β (95% CI)
Dense area (cm2)
 Maternal Education at birth
  Less than high school (reference)
  High school graduate 0.01 (−4.3, 4.3) −0.6 (−5.2, 3.9) −1.7 (−6.3, 3.0)
  Trade school or some college −0.8 (−5.7, 4.2) −2.9 (−8.0, 2.2) −4.3 (−9.8, 1.1)
  College graduate or higher education 1.8 (−4.4, 8.0) −1.4 (−8.3, 5.4) −4.8 (−12.1, 2.4)
Family income at birth
  < $5000 (reference)
 $5000-$7999 −1.2 (−5.1, 2.7) −1.4 (−5.4, 2.6) −1.5 (−5.7, 2.7)
  ≥ $8000 −6.3 (−11.0, −1.6) −6.9 (−11.8, −2.1) −8.2 (−13.3, −3.2)
Non-dense area (cm2)
 Maternal education at birth
  Less than high school (reference)
  High school graduate −7.7 (−18.0, 2.6) −5.4 (−15.6, 4.8) −5.7 (−16.5, 5.0)
  Trade school or some college −1.0 (−13.4, 11.4) −3.3 (−16.1, 9.6) −3.8 (−17.0, 9.4)
  College graduate or higher education −8.2 (−20.8, 4.4) −5.5 (−19.2, 8.3) −3.5 (−18.6, 11.5)
 Family income at birth
   < $5000 (reference)
  $5000-$7999 −4.3 (−13.2, 4.6) −3.6 (−12.4, 5.2) −1.9 (−11.1, 7.3)
   ≥ $8000 −1.9 (−13.2, 9.4) −1.6 (−13.5, 10.2) 0.8 (−11.4, 12.9)
Percent density
  Maternal education at birth
  Less than high school (reference)
  High school graduate 1.4 (−1.4, 4.2) 0.7 (−2.2, 3.7) 0.4 (−2.6, 3.4)
  Trade school or some college 0.5 (−2.8, 3.8) −0.2 (−3.7, 3.3) −0.8 (−4.4, 2.9)
  College graduate or higher education 4.8 (0.6, 9.1) 3.4 (−1.4, 8.2) 1.1 (−4.0, 6.2)
Family income at birth
  < $5000 (reference)
 $5000-$7999 −0.7 (−3.2, 1.8) −0.7 (−3.3, 1.8) −0.9 (−3.6, 1.8)
  ≥ $8000 −2.6 (−6.1, 0.9) −2.3 (−6.0, 1.4) −3.2 (−6.9, 0.5)
  1. Abbreviations: PTS prenatal tobacco exposure to maternal smoking during pregnancy, BMI Body mass index, CI confidence interval