Table 1.

Distribution of participants' demographic characteristics and their association with mammographic density for continuous variables

Data distribution
Univariate regress adjusted for age*
nMean (SD)Estimates (SE)P
Breast density (%)23633.89 (25.67)NANA
Age (y)23642.81 (17.89)−0.20 (0.09)0.04
Height (m)2361.63 (0.07)−2.99 (24.23)0.90
Weight (kg)23660.81 (13.99)−0.75 (0.11)<0001
BMI (kg/m2)23623.02 ( 5.20)−2.02 (0.30)<0001
Age at first menstruation (y)7212.74 (1.67)0.28 (1.75)0.88
Age at first birth (y)8221.90 (4.79)0.38 (0.60)0.53
No. birth1392.05 (2.34)−2.43 (1.00)0.02
Age at menstruation stop (y)3643.31 (7.06)0.98 (0.72)0.18
  • * Univariate linear regression analysis of mammographic density against the corresponding demographic variables listed in the left column, adjusted for age.

  • Variables with missing data.