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Table 1 Census tract measures of population, transportation, and mammography sites in Delaware overall and by county

From: A catchment and location-allocation analysis of mammography access in Delaware, US: implications for disparities in geographic access to breast cancer screening

Measure

Mean (standard deviation)

Delaware

New Castle county

Kent & Sussex counties

N. tracts

214

129

85

Population of women ≥ 40

250,811

140,374

110,437

Deprivationa

0 (1)

0 (1)

0 (1)

N. women 40–49

277 (188)

284 (193)

266 (181)

N. women 50–74

719 (384)

649 (328)

824 (437)

N. women > 74

176 (108)

155 (102)

209 (109)

Percent Black women

22 (22)

26 (25)

16 (14)

Percent w/ vehicles

93 (9)

91 (11)

95 (4)

N. bus stops

11 (10)

14 (11)

7 (8)

N. mammography sites

0.1 (0.4)

0.1 (0.4)

0.2 (0.5)

N. mammography units

0.2 (0.8)

0.2 (0.9)

0.2 (0.7)

N. BICOE sites

 < 0.1 (0.2)

0.1 (0.3)

 < 0.1 (0.2)

N. BICOE units

0.1 (0.7)

0.1 (0.8)

0.1 (0.3)

  1. BICOE breast imaging center of excellence
  2. aOperationalized as a Z-score composite of census tract indicators for education, employment, income and poverty, and household composition