Skip to main content

Advertisement

Table 1 Distribution of demographic, reproductive, and lifestyle risk factors by race/ethnicity in the combined LACE and Pathways Studies (n = 2544)

From: Epidemiology of breast cancer subtypes in two prospective cohort studies of breast cancer survivors

  White Total n = 1943 n (%) African American Total n = 155 n (%) Asian Total n = 189 n (%) Hispanic Total n = 197 n (%) Other Total n = 54 n (%) Pvaluea
Age at diagnosis (years)       < 0.0001
   < 50 389 (20.0) 43 (27.7) 61 (32.3) 67 (34.0) 13 (24.1)  
   50 to 64 879 (45.2) 80 (51.6) 87 (46.0) 80 (40.6) 29 (53.7)  
   ≥ 65 675 (34.7) 32 (20.6) 41 (21.7) 50 (25.4) 12 (22.2)  
   mean (± standard deviation) 59.8 (11.2) 56.2 (10.7) 54.8 (11.0) 55.7 (12.4) 57.7 (9.8)  
Menopausal status       < 0.0001
   Postmenopausal 1,330 (75.6) 90 (71.4) 104 (59.1) 117 (65.4) 35 (72.9)  
   Premenopausal 430 (24.4) 36 (28.6) 72 (40.9) 62 (34.6) 13 (27.1)  
Family history       0.001
   No 1,503 (77.4) 133 (85.8) 163 (86.2) 167 (84.8) 41 (75.9)  
   Yes 440 (22.6) 22 (14.2) 26 (13.8) 30 (15.2) 13 (24.1)  
Parity       0.006
   Nulliparous 343 (17.7) 22 (14.2) 46 (24.3) 31 (15.7) 9 (16.7)  
   1 to 2 children 894 (46.0) 67 (43.2) 93 (49.2) 79 (40.1) 31 (57.4)  
   ≥ 3 children 706 (36.3) 66 (42.6) 50 (26.5) 87 (44.2) 14 (25.9)  
Age at first full-term pregnancy (years)       < 0.0001
   Nulliparous 343 (17.7) 22 (14.3) 46 (24.3) 31 (15.8) 9 (16.7)  
   < 26 1,020 (52.6) 113 (73.4) 61 (32.3) 119 (60.7) 28 (51.9)  
   ≥ 26 578 (29.8) 19 (12.3) 82 (43.4) 46 (23.5) 17 (31.5)  
Lifetime duration of lactation       0.215
   Never 908 (47.3) 92 (59.7) 81 (44.3) 91 (48.1) 25 (47.2)  
   0 to 3 months 279 (14.5) 19 (12.3) 31 (16.9) 25 (13.2) 8 (15.1)  
   ≥ 4 months 733 (38.2) 43 (27.9) 71 (38.8) 73 (38.6) 20 (37.7)  
Alcohol use       < 0.0001
   Never 675 (39.9) 77 (67.5) 116 (75.3) 93 (62.4) 28 (57.1)  
   Ever 1,016 (60.1) 37 (32.5) 38 (24.7) 56 (37.6) 21 (42.9)  
Smoking history (years)       < 0.0001
   Never 925 (48.0) 73 (47.4) 148 (78.3) 113 (57.4) 22 (40.7)  
   ≤ 10 269 (14.0) 17 (11.0) 13 (6.9) 33 (16.8) 6 (11.1)  
   11 to 19 169 (8.8) 10 (6.5) 8 (4.2) 6 (3.0) 5 (9.3)  
   ≥ 20 563 (29.2) 54 (35.1) 20 (10.6) 45 (22.8) 21 (38.9)  
Hormone replacement therapy (postmenopausal women only)       
   Never 310 (23.8) 37 (42.1) 47 (45.6) 37 (32.2) 12 (34.3)  
   Ever 994 (76.2) 51 (57.9) 56 (54.4) 78 (67.8) 23 (65.7)  
Oral contraceptive use       < 0.0001
   Never 638 (33.8) 40 (26.7) 100 (55.9) 72 (37.7) 16 (30.2)  
   Ever 1,252 (66.2) 110 (73.3) 79 (44.1) 119 (62.3) 37 (69.8)  
Body mass index (kg/m2)b       < 0.0001
   < 25 835 (43.4) 31 (20.0) 119 (63.3) 63 (32.5) 20 (37.0)  
   25 to 29 600 (31.1) 48 (31.0) 46 (24.5) 64 (33.0) 14 (25.9)  
   ≥ 30 491 (25.5) 76 (49.0) 23 (12.2) 67 (34.5) 20 (37.0)  
  1. a From Pearson chi-square test across racial/ethnic categories.
  2. b Body mass index one year pre-diagnosis (LACE) and around diagnosis (Pathways).