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Table 2 Summary of closest, actual, and differential travel times in sample of BCSC mammograms by woman, facility, and census-level characteristics

From: Is the closest facility the one actually used? An assessment of travel time estimation based on mammography facilities

  Geographic level of variable Travel time-median and IQR Cumulative distribution of differential travel time (proportion)
Closest facility Actual facility (actual = closest) 0 m <5 m <10 m <30 m
All   5 (3,10) 9 (5,17) 0.35 0.73 0.84 0.96
Woman-level characteristics        
Age Woman level       
 30–40   6 (3,11) 11 (6,19) 0.29 0.68 0.79 0.94
 40–49   5 (3,10) 10 (6,18) 0.33 0.7 0.82 0.96
 50–59   6 (3,11) 10 (6,18) 0.34 0.72 0.83 0.95
 60–69   5 (3,11) 9 (5,17) 0.37 0.74 0.84 0.95
 70–79   5 (2,9) 8 (4,15) 0.40 0.79 0.88 0.96
 80+   4 (2,8) 7 (4,12) 0.44 0.83 0.91 0.98
Race/ethnicity Woman level       
 White, non-Hispanic   6 (3,12) 10 (6,19) 0.39 0.74 0.83 0.95
 Black, non-Hispanic   5 (3,10) 10 (6,21) 0.31 0.68 0.78 0.92
 Hispanic   6 (3,10) 9 (6,14) 0.36 0.76 0.89 0.97
 Asian   3 (2,5) 8 (4,11) 0.16 0.66 0.86 0.98
 Native American   5 (3,10) 10 (6,16) 0.28 0.73 0.87 0.96
 Other   4 (2,8) 8 (4,16) 0.32 0.72 0.84 0.97
Education Woman level       
 Less than high school   4 (2,7) 8 (4,12) 0.37 0.77 0.90 0.97
 High school   6 (3,13) 10 (5,19) 0.43 0.75 0.85 0.95
 Some college   5 (3,10) 9 (5,18) 0.37 0.72 0.82 0.95
 College or post-college graduate   4 (2,9) 9 (5,16) 0.31 0.71 0.83 0.96
Census-levelb characteristics        
Rurality Censusb: 2006 zip code       
 Urban core   4 (2,7) 8 (5,13) 0.29 0.75 0.87 0.98
 Suburban areas   18 (12,24) 23 (15,32) 0.43 0.69 0.79 0.96
 Large town areas   9 (4,16) 14 (6,27) 0.47 0.72 0.77 0.9
 Small town and isolated rural   14 (6,25) 23 (9,41) 0.57 0.65 0.7 0.86
Median household income Censusb: Block group       
 <45K   6 (3,14) 10 (5,25) 0.43 0.73 0.8 0.92
 45–59,999K   8 (3,14) 12 (6,23) 0.38 0.72 0.81 0.94
 60–84,999K   5 (3,9) 9 (6,15) 0.34 0.74 0.88 0.98
 85K+   4 (2,7) 8 (5,14) 0.28 0.72 0.85 0.98
Diversity index Censusb: Tract       
 0–25   11 (5,18) 14 (7,24) 0.53 0.76 0.83 0.95
 26–50   6 (2,10) 9 (5,17) 0.35 0.74 0.82 0.95
 51–75   4 (2,7) 8 (5,14) 0.27 0.72 0.85 0.96
 76–100   4 (2,8) 9 (5,14) 0.28 0.69 0.83 0.97
Average spent on public transportation Censusb: Block group       
 <100$   8 (4,14) 12 (7,22) 0.38 0.72 0.82 0.93
 >100$   3 (2,6) 7 (4,12) 0.31 0.75 0.86 0.98
Median travel time to work Censusb: Block group       
 <15 min   4 (2,6) 6 (3,15) 0.54 0.78 0.8 0.88
 15–30 min   6 (3,11) 10 (6,17) 0.36 0.74 0.84 0.96
 >30 min   5 (3,9) 9 (6,19) 0.22 0.69 0.85 0.98
Actual facilitya characteristics        
Academic status Facility levela       
 Academic   4 (2,9) 9 (5,17) 0.31 0.69 0.83 0.95
 Non-academic   4 (2,8) 9 (5,14) 0.33 0.75 0.87 0.98
Practice type Facility levela       
 Multispecialty   3 (2,6) 8 (4,14) 0.22 0.68 0.83 0.98
 General radiology   5 (2,9) 9 (5,15) 0.38 0.77 0.88 0.97
 Breast imaging only   7 (4,11) 10 (7,16) 0.22 0.72 0.87 0.96
 Non-radiology   8 (4,14) 12 (7,21) 0.42 0.73 0.85 0.98
  1. aFacility where the exam took place
  2. bCensus-level variable for woman’s place of residence