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Table 1 Comparison of characteristics of women participating in the California Teachers Study mammographic density substudy who were included in the analyses with those of participants who were excluded from the analyses

From: Hormone metabolism pathway genes and mammographic density change after quitting estrogen and progestin combined hormone therapy in the California Teachers Study

Characteristics

Interviewed participants not included in the current analysis (n = 720)

Interviewed participants included in the current analysis (non-Hispanic white EPT quitters) (n = 284)

P values

At cohort enrollment

   

Age (mean ± SD)

49.9 ± 4.2 (range 40-60)

50.5 ± 3.8 (range 41-60)

0.07

BMI (kg/m2)

24.6 ± 4.8 (range 17-50)

24.7 ± 4.9 (range 17-47)

0.68

White (N (%))

624 (87%)

284 (100%)

 

Nulliparous women (N (%))

141 (20%)

63 (22%)

0.33

Menopausal status

   

 Premenopausal

432 (60%)

155 (55%)

0.012

 Perimenopausal

87 (12%)

55 (19%)

 

 Postmenopausal

201 (28%)

74 (26%)

 

Ever had breast biopsy (N (%))

108 (15%)

40 (14%)

0.71

Positive 1st degree family history of breast cancer (N (%))

64 (9%)

37 (13%)

0.053

At mammogram substudy enrollment

   

Age at interview (mean ± SD)

62 ± 4.0 (range 52-71)

62 ± 3.6 (range 53-72)

0.11

BMI (kg/m2)

26.2 ± 5.2 (range 17-49)

25.7 ± 5.0 (range 18-47)

0.16

Positive 1st degree family history of breast cancer (N (%))

112 (16%)

51 (18%)

0.43

Number of mammograms in the past 10 years

8.8 ± 2.3 (range 2-20)

8.9 ± 2.2 (range 2-18)

0.59

At time of mammography evaluated for density

   

Age at time of mammogram while taking EPT

 

56 ± 4 (range 45-67)

 

Age at time of mammogram while off EPT

 

60 ± 5 (range 49-71)

 

BMI at time of mammogram while taking EPT

 

25.7 ± 5.2 (range 18-47)

 

BMI at time of mammogram while off EPT

 

25.8 ± 5.0 (range 18-48)

 

Years on EPT at time of mammogram while taking EPT

   

 <1 year

 

15 (5%)

 

 1- < 4 years

 

121 (43%)

 

 4- < 7 years

 

112 (39%)

 

 ≥7 years

 

36 (13%)

 

Time interval between two mammograms (years)

   

 ≤3 years

 

141 (50%)

 

 4-5 years

 

106 (37%)

 

 6-9 years

 

37 (13%)

 
  1. EPT, estrogen and progestin combined therapy; BMI, body mass index.