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Table 1 Women included in the study, descriptive statistics

From: Gene expression profiles of breast biopsies from healthy women identify a group with claudin-low features

   all non-cancer (%) cluster 1 (%) cluster 2 (%) p-value (cluster 1 vs 2)
Age mean 50.2 49.3 49.8.4 0.87 1)
  <40 14 (18) 3 (25) 11 (16)  
  40-49 17 (22) 2 (17) 15 (22)  
  50-69 43 (54) 6 (50) 37 (55)  
  70+ 2 (3) 1 (8) 1 (1)  
  missing 3 (4) 0 (0) 3 (4)  
Parity 0 10 (13) 4 (33) 6 (9) 0.05 2)
  1+ 65 (82) 8 (67) 57 (85)  
  missing 4 (5) 0 (0) 4 (6)  
Age at first birth mean 24.4 24 24.6 0.75 1)
  no children 10 (13) 4 (33) 6 (9)  
  <25 30 (38) 4 (33) 26 (39)  
  25-34 24 (30) 3 (25) 21 (31)  
  35+ 2 (3) 0 (0) 2 (3)  
  missing 13 (16) 1 (8) 12 (18)  
Hormone therapy use never 55 (70) 8 (67) 47 (70) 0.72 2)
  current 11 (14) 2 (17) 9 (13)  
  past 6 (8) 0 (0) 6 (9)  
  missing 7 (9) 2 (17) 5 (7)  
Body mass index mean 24 23 24.5 0.24 1)
  <20 5 (6) 2 (17) 3 (4)  
  20-<25 44 (56) 6 (50) 38 (57)  
  25-<30 21 (27) 4 (33) 17 (25)  
  30+ 6 (8) 0 (0) 6 (9)  
  missing 3 (4) 0 (0) 3 (4)  
Mammographic density mean 39.6 36.7 37 0.62 1)
  0-<23 19 (24) 2 (17) 17 (25)  
  23-<37 21 (27) 4 (33) 17 (25)  
  37-<52 19 ((24) 3 (25) 16 (24)  
  52+ 17 (22) 3 (25) 14 (21)  
  missing 3 (4) 0 (0) 3 (4)  
Referral source risk/lump 32 (41) 9(75) 23 (33) 0.007 2)
  screening 28 (36) 0 (0) 28 (42)  
  unknown 19 (24) 3 (25) 16 (24)  
  1. 1) Two-sided t-test for continuous variables
  2. 2) Fisher exact test for categorical variables with <5 observations in certain cells