Table 1.

Characteristics of study participants at their baseline screening mammogram at ages 35 to 39, overall and by whether they returned to a BCSC facility for future mammography between ages 40 and 45a

 OverallHad future mammography at ages 40–45 as captured in the BCSCDid not have future mammography at ages 40–45 as captured in the BCSC
n%bn%n%
Total29,39020,1929,198
Age at baseline mammogram
 353,29411.22,09510.41,19913.0
 364,29114.62,70113.41,59017.3
 375,71219.43,83519.01,87720.4
 386,73722.94,75123.51,98621.6
 399,35631.86,81033.72,54627.7
Race/ethnicity
 White22,88877.915,79478.27,09477.1
 AA2,6098.91,5857.81,02411.1
 Asian2,0026.81,5817.84214.6
 Hispanic1,8916.41,2326.16597.2
Education level
 Less than high school graduate1,0574.56814.13765.7
 High school graduate/GED5,30722.83,75922.51,54823.5
 Some college/technical school6,52628.04,55927.31,96729.9
 College graduate10,38844.67,70046.12,68840.9
 Unknown6,1123,4932,619
Rural/urban status
 Urban focused20,46170.113,29666.37,16578.7
 Large rural4,17814.33,23216.194610.4
 Small/isolated rural4,53615.63,53817.799811.0
 Unknown21512689
First-degree family history of breast cancer
 No18,29490.113,20090.25,09489.8
 Yes2,0099.91,4309.857910.2
 Unknown9,0875,5623,525
Baseline mammography outcome
 False positive3,35711.42,44512.19129.9
 True negative26,03388.617,74787.98,28690.1
Additional screening before age 40
 No25,67887.417,06284.58,61693.7
 Yes3,71212.63,13015.55826.3
Number of mammograms (any type) before age 40
 Baseline mammogram only23,14678.815,12474.98,02287.2
 24,41115.03,52217.48899.7
 3+1,8336.21,5467.72873.1
  • aData years: 1994–2008.

  • bColumn percentages are calculated among the nonmissing values.