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. Author manuscript; available in PMC: 2017 Jan 1.
Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2015 Nov 6;25(1):212–216. doi: 10.1158/1055-9965.EPI-15-0412

Table 1.

Longitudinal mammographic percent density among ER-positive breast cancer patients treated with tamoxifen (N=40).

Calculated mean percent density (SD) Calculated mean differencea in percent density (SD) Adjusted mean differencea, b in percent density (SE)

Baseline 26.5 (18.0)
T1 22.0 (12.3) -4.5 (11.4) -2.0 (1.2)
T2 20.2 (12.7) -1.7 (7.6) 0.0 (1.2)
T3 19.1 (12.1) -1.1 (6.9) 0.5 (1.1)
T4 18.6 (11.3) -0.3 (5.8) 1.1 (0.9)
T5 19.3 (11.4) 0.6 (6.7) 2.1 (1.1)
a

Mean difference, compared to previous year

b

Estimated using linear regression, adjusted for baseline percent density (ordinal tertiles)

SD – standard deviation; SE – standard error