Table 1.

Feature Variables Used in Our Study

Feature Variable	Instances
Age	<46, 46–50, 51–55, 56–60, 61–65, >65
Personal history of breast cancer	Yes, no
Family history of breast cancer *	None, minor, major
Surgery history of breast cancer	Yes, no
Hormone replacement therapy	Yes, no
Breast composition **	1, 2, 3, 4
Mass shape	Oval, round, lobular, irregular, missing
Mass stability	Decreasing, stable, increasing, missing
Mass margin	Circumscribed, ill defined, microlobulated, speculated
Mass density	Fat, low, equal, high, missing
Mass size	None, small (<3 cm), large (>3 cm)
Lymph node	Present, not present
Asymmetric density	Present, not present
Tubular density	Present, not present
Skin retraction	Present, not present
Nipple retraction	Present, not present
Skin thickening	Present, not present
Trabecular thickening	Present, not present
Skin lesion	Present, not present
Axillary adenopathy	Present, not present
Architectural distortion	Present, not present
Calcifications
Popcorn	Present, not present
Milk of calcium	Present, not present
Rod-like	Present, not present
Eggshell	Present, not present
Dystrophic	Present, not present
Lucent	Present, not present
Dermal	Present, not present
Round	Scattered, regional, clustered, segmental, linear ductal
Punctate	Scattered, regional, clustered, segmental, linear ductal
Amorphous	Scattered, regional, clustered, segmental, linear ductal
Pleomorphic	Scattered, regional, clustered, segmental, linear ductal
Fine linear	Scattered, regional, clustered, segmental, linear ductal

^*minor = non-first-degree family member(s) with a diagnosis of breast cancer, major = one or more first-degree family member(s) with a diagnosis of breast cancer.

^**1 = predominantly fatty, 2 = scattered fibroglandular, 3 = heterogeneously dense, 4 = extremely dense.