Table 2.

Characteristics of 20,192 women in our study samplea with follow-up, by race/ethnicity and FP or TN baseline mammography results

 Total (N = 20,192)White (N = 15,794)AA (N = 1,585)Asian (N = 1,581)Hispanic (N = 1,232)
n%bn%n%n%n%
FP2,44512.11,95512.420112.71288.116113.1
TN17,74787.913,83987.61,38487.31,45391.91,07186.9
Mean (SD) months between baseline and future mammogram40.6 (20.5)40.8 (20.6)41.8 (21.1)37.9 (18.9)40.2 (20.9)
Age at first (baseline) mammogram
 352,09510.41,75011.117110.8966.1786.3
 362,70113.42,16813.721313.418111.413911.3
 373,83519.03,02719.230219.127317.323318.9
 384,75123.53,68623.337923.937924.030724.9
 396,81033.75,16332.752032.865241.247538.6
Education level
 Less than high school graduate6814.13342.51058.515611.48613.5
 High school graduate/GED3,75922.52,95822.037430.127219.915524.4
 Some college/ technical school4,55927.33,69327.438230.829421.519029.9
 College graduate7,70046.16,47048.138130.764447.120532.2
 Unknown3,4932,339343215596
First-degree family history of breast cancer
 No13,20090.210,51690.033787.81,30993.01,03890.2
 Yes1,4309.81,17110.04712.2997.01139.8
 Unknown5,5624,1071,20117381
Rural/urban status
 Urban focused13,29666.39,59261.11,13171.71,52897.81,04585.7
 Large rural3,23216.12,90018.521213.4191.21018.3
 Small/isolated rural3,53817.73,21620.523414.8151.0736.0
 Unknown1268681913
Additional screening prior to age 40
 No17,06284.513,25283.91,33684.31,39588.21,07987.6
 Yes3,13015.52,54216.124915.718611.815312.4
Number of mammograms (any type) prior to age 40
 Baseline15,12474.911,70674.11,16073.21,29782.096178.0
 23,52217.42,82617.929818.820412.919415.7
 3+1,5467.71,2628.01278.0805.1776.3
  • aStudy sample defined as women who had a baseline screening mammogram ages 35 to 39 in the BCSC data in years 1994–2002 and followed to ages 40 to 45 at the time of their first post-40 mammogram.

  • bPercentages are calculated among the nonmissing values.