Table 2.

Cross-tabulation of women in each BI-RADS density category at first mammogram compared with value at second mammogram (row percent); Group Health, 1996-2006

Any NSAID use and BI-RADS density category at first mammogramBI-RADS density category at second mammogram
Entirely fat, n (%)Scattered fibroglandular, n (%)Heterogeneously dense, n (%)Extremely dense, n (%)
Nonuser
    Entirely fat869 (45.4)972 (50.8)67 (3.5)6 (0.3)
    Scattered fibroglandular676 (7.5)6,077 (67.2)2,238 (24.7)55 (0.6)
    Heterogeneously dense35 (0.4)1,800 (22.1)5,721 (70.0)614 (7.5)
    Extremely dense2 (0.1)45 (3.0)747 (49.0)729 (47.9)
Initiator
    Entirely fat314 (46.8)332 (49.5)24 (3.6)< 5 (0.1)
    Scattered fibroglandular240 (8.4)1,943 (68.3)646 (22.7)16 (0.6)
    Heterogeneously dense12 (0.5)526 (24.8)1,439 (67.8)146 (6.9)
    Extremely dense0 (0.0)<5 (0.9)185 (54.6)151 (44.5)
Discontinuer
    Entirely fat49 (46.2)54 (51.0)< 5 (2.8)0 (0.0)
    Scattered fibroglandular37 (6.8)386 (70.7)119 (21.8)< 5 (0.7)
    Heterogeneously dense0 (0.0)123 (28.0)295 (67.2)21 (4.8)
    Extremely dense0 (0.0)<5 (3.1)39 (60.0)24 (36.9)
Continuer
    Entirely fat51 (44.0)63 (54.3)< 5 (1.7)0 (0.0)
    Scattered fibroglandular38 (9.1)287 (68.3)95 (22.6)0 (0.0)
    Heterogeneously dense<5 (0.4)65 (24.3)183 (68.6)18 (6.7)
    Extremely dense0 (0.0)< 5 (2.9)18 (51.4)16 (45.7)
Mixed
    Entirely fat41 (58.6)29 (41.4)0 (0.0)0 (0.0)
    Scattered fibroglandular33 (9.8)219 (65.2)83 (24.7)< 5 (0.3)
    Heterogeneously dense<5 (0.5)58 (26.6)149 (68.3)10 (4.6)
    Extremely dense0 (0.0)0 (0.0)15 (42.9)20 (57.1)