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Table 1 Characteristics of women with breast cancer and their matched controls

From: Breast asymmetry and predisposition to breast cancer

Variablea Cases of cancer (n = 252) Controls (n = 252)
Hypothesised risk factors   
   Absolute breast volume FA (ml; median (IQR)) 63.17 (88.54) 52.99 (68.38)
   Relative breast volume FA (%; median (IQR)) 2.70 (3.63) 2.49 (2.91)
Other potential risk factors/confounders   
   BMI (n = 503; mean (SD)) 23.8 (3.11) 23.9 (3.22)
   Height (cm; mean (SD)) 161.7 (6.10) 159.7 (5.88)
   Age at menarche (years; n = 503; mean (SD)) 13.0 (1.61) 13.6 (1.68)
   Age at 1st pregnancy (years; n = 400; mean (SD)) 25.4 (4.19) 23.9 (4.31)
   Number of pregnancies (n = 503; median (IQR)) 2 (2) 2 (2)
   Family history 68 (27%) 32 (13%)
   Mean breast volume (ml; median (IQR)) 569 (388) 582 (370)
   Parenchyma type: right breast   
N1 21 (8%) 54 (21%)
P1 42 (17%) 33 (13%)
P2 65 (26%) 40 (16%)
DY 124 (49%) 125 (50%)
   Parenchyma type: left breast   
N1 21 (8%) 55 (22%)
P1 42 (17%) 33 (13%)
P2 65 (26%) 43 (17%)
DY 124 (49%) 121 (48%)
   Menopausal status (n = 482)   
Pre 99 (41%) 76 (32%)
Peri 44 (18%) 49 (20%)
Post 100 (41%) 114 (48%)
   Age at menopause (years; n = 212; median (IQR)) 50 (4) 47 (6)
  1. Values are numbers (percentages) unless stated otherwise. aIncomplete total is indicated in brackets where there are missing data. Absolute breast volume fluctuating asymmetry (FA) = unsigned values (|L - R|) of breast volume. Relative breast volume FA = 100 × |L - R| breast volume/[|L + R| breast volume] 0.5. BMI, body mass index; IQR, inter-quartile range; SD, standard deviation.