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Table 1 Patients characteristics according to mammographic density at diagnosis

From: Mammographic density is a potential predictive marker of pathological response after neoadjuvant chemotherapy in breast cancer

  BI-RADSa aBI-RADS bBI-RADS cBI-RADS d
Number of patients 1612014026
Agemedian (IQR)59 (54–68)59 (50–66)49 (41–60)44 (37–54)
BMImedian (IQR)30 (27–35)27 (24–30)24 (22–27)23 (21–26)
Number of pregnancies01 (6.3)9 (7.5)25 (17.9)3 (11.5)
1 21 (17.5)22 (15.7)3 (11.5)
26 (37.5)34 (28.3)51 (36.4)10 (38.5)
3+9 (56.3)55 (45.8)41 (29.3)10 (38.5)
missing 1 (0.8)1 (0.7) 
Age at first birthmedian (IQR)24 (23–24)26 (23–29)29 (25–33)29 (28–33)
Age at menarchemedian (IQR)13 (13–15)13 (12–14)13 (12–14)12 (11–13)
Menopausal statuspremenopausal4 (25.0)31 (25.8)83 (59.3)18 (69.2)
postmenopausal12 (75.0)89 (74.2)57 (40.7)8 (30.8)
Smokingcurrent3 (18.8)29 (24.2)16 (11.4)4 (15.4)
former3 (18.8)16 (13.3)9 (6.4)2 (7.7)
never9 (56.3)64 (53.3)104 (74.3)19 (73.1)
missing1 (6.3)11 (9.2)11 (7.9)1 (3.8)
Hormone replacement therapycurrent1 (6.3)4 (3.3)3 (2.1)1 (3.8)
former3 (18.8)20 (16.7)14 (10.0) 
never12 (75.0)92 (76.7)123 (87.9)25 (96.2)
missing 4 (3.3)  
Oral contraceptivescurrent 8 (6.7)23 (16.4)5 (19.2)
former3 (18.8)33 (27.5)37 (26.4)7 (26.9)
never8 (50.0)49 (40.8)57 (40.7)11 (42.3)
missing5 (31.3)30 (25.0)23 (16.4)3 (11.5)
  1. aThroughout the table BI-RADS breast composition is intended