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Table 1 Vital status and factors potentially related to breast density and tumour detection

From: Breast density and mode of detection in relation to breast cancer specific survival: a cohort study

Factors Category Alive (n = 496) Dead breast cancer (n = 76) Dead other cause (n = 47) All (n = 619)
   Number (column percent)Mean, SD in italics
Age at baseline Years 56.0 (6.6) 58.2 (7.8) 61.6 (6.9) 56.7 (7.0)
Age at diagnosis Years 64.0 (7.3) 64.5 (8.7) 67.8 (7.6) 64.4 (7.5)
HRT at diagnosis No 169 (34.1) 17 (22.4) 11 (23.4) 197 (31.8)
  Yes 168 (33.9) 21 (27.6) 11 (23.4) 200 (32.3)
  Unknown 159 (32.0) 38 (50.0) 25 (53.2) 222 (35.9)
Menopausal status at diagnosis Premenopausal 40 (8.1) 11 (14.5) 2 (4.3) 53 (8.6)
  Postmenopausal 446 (89.9) 65 (85.5) 42 (89.4) 553 (89.3)
  Unknown 10 (2.0) 0 (0.0) 3 (6.4) 13 (2.1)
BMI at baseline <20 21 (4.2) 4 (5.3) 2 (4.3) 27 (4.4)
  20- < 25 242 (48.8) 33 (43.4) 18 (38.3) 293 (47.3)
  25- < 30 159 (32.1) 30 (39.5) 14 (29.8) 203 (32.8)
  ≥30 74 (14.9) 9 (11.8) 13 (27.7) 96 (15.5)
Detection mode (three categories) Non-symptomatic 301 (60.7) 27 (35.5) 22 (46.8) 350 (56.5)
  Interval 68 (13.7) 13 (17.1) 6 (12.8) 87 (14.1)
  Symptomatic 122 (24.6) 36 (47.4) 19 (40.4) 177 (28.6)
  Unknown* 5 (1.0) 0 (0.0) 0 (0.0) 5 (0.8)
Detection mode (symptomatic including interval cancer) Non-symptomatic 301 (60.7) 27 (35.5) 22 (46.8) 350 (56.5)
  Symptomatic 195 (39.3) 49 (64.5) 25 (53.2) 269 (43.5)
Breast density Fatty 73 (14.7) 7 (9.2) 13 (27.7) 93 (15.0)
  Moderate 254 (51.2) 37 (48.7) 21 (44.7) 312 (50.4)
  Dense 169 (34.1) 32 (42.1) 13 (27.7) 214 (34.6)
Diagnostic period 1991-1996 62 (12.5) 21 (27.6) 11(23.4) 94 (15.2)
  1997-2001 173 (34.9) 28 (36.8) 19 (40.4) 220 (35.6)
  2002-2007 261 (52.6) 27 (35.5) 17 (36.2) 305 (49.3)
  1. *Unknown if interval or symptomatic cancer.