Table 3.
Validation statistics for the EPOI database
| Traditional measures | Relaxed measures | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |
N Total |
N List |
N Field |
Sensitivity |
Positive predictive value |
Relaxed sensitivity |
Relaxed positive predictive value |
Representativity |
|||||
|
Est. |
Est. |
Est. |
Est. |
Est. |
|||||||||
| Overall |
549 |
410 |
484 |
0.545 |
0.644 |
0.655 |
0.773 |
0.777 |
|||||
| 0.487 |
0.603 |
0.592 |
0.696 |
0.592 |
0.718 |
0.736 |
0.810 |
0.713 |
0.840 |
||||
| Census tract characteristics |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Low SES |
104 |
73 |
90 |
0.567 |
0.699 |
0.700 |
0.732 |
0.756 |
|||||
| 0.508 |
0.625 |
0.590 |
0.808 |
0.478 |
0.923 |
0.581 |
0.882 |
0.723 |
0.788 |
||||
| Medium SES |
211 |
164 |
192 |
0.531 |
0.622 |
0.748 |
0.830 |
0.797 |
|||||
| 0.454 |
0.608 |
0.515 |
0.729 |
0.578 |
0.917 |
0.788 |
0.871 |
0.753 |
0.841 |
||||
| High SES |
234 |
173 |
202 |
0.550 |
0.642 |
0.578 |
0.709 |
0.762 |
|||||
| 0.422 |
0.677 |
0.605 |
0.678 |
0.394 |
0.761 |
0.660 |
0.758 |
0.628 |
0.897 |
||||
| English |
392 |
295 |
349 |
0.533 |
0.631 |
0.690 |
0.755 |
0.791 |
|||||
| 0.472 |
0.594 |
0.567 |
0.694 |
0.544 |
0.837 |
0.713 |
0.798 |
0.740 |
0.842 |
||||
| French |
157 |
115 |
135 |
0.578 |
0.678 |
0.660 |
0.758 |
0.733 |
|||||
| 0.462 |
0.693 |
0.592 |
0.764 |
0.485 |
0.835 |
0.644 |
0.873 |
0.633 |
0.833 |
||||
| Categories of outlet |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Convenience store |
65 |
51 |
63 |
0.587 |
0.725 |
0.746 |
0.922 |
0.762 |
|||||
| 0.489 |
0.686 |
0.604 |
0.847 |
0.636 |
0.856 |
0.856 |
0.987 |
0.644 |
0.880 |
||||
| Chain supermarkets |
4 |
3 |
4 |
0.750 |
1.000 |
0.750 |
1.000 |
0.750 |
|||||
| 0.325 |
1.175 |
1.000 |
1.000 |
0.325 |
1.175 |
1.000 |
1.000 |
0.325 |
1.175 |
||||
| Grocery stores |
38 |
29 |
33 |
0.485 |
0.552 |
0.485 |
0.552 |
0.545 |
|||||
| 0.278 |
0.692 |
0.371 |
0.732 |
0.278 |
0.692 |
0.371 |
0.732 |
0.361 |
0.730 |
||||
| Bakeries |
30 |
21 |
27 |
0.481 |
0.619 |
0.556 |
0.714 |
0.593 |
|||||
| 0.289 |
0.674 |
0.428 |
0.810 |
0.320 |
0.791 |
0.512 |
0.916 |
0.338 |
0.847 |
||||
| Specialty markets |
18 |
13 |
14 |
0.643 |
0.692 |
0.643 |
0.692 |
0.786 |
|||||
| 0.423 |
0.863 |
0.563 |
0.822 |
0.423 |
0.863 |
0.563 |
0.822 |
0.539 |
1.032 |
||||
| Fruit and vegetable stores |
13 |
9 |
11 |
0.455 |
0.556 |
0.636 |
0.778 |
0.727 |
|||||
| 0.170 |
0.740 |
0.304 |
0.807 |
0.353 |
0.920 |
0.502 |
1.053 |
0.414 |
1.040 |
||||
| Natural food stores |
17 |
9 |
16 |
0.438 |
0.778 |
0.438 |
0.778 |
0.500 |
|||||
| 0.141 |
0.734 |
0.413 |
1.142 |
0.141 |
0.734 |
0.413 |
1.142 |
0.200 |
0.800 |
||||
| Megamarkets |
1 |
1 |
1 |
1.000 |
1.000 |
1.000 |
1.000 |
1.000 |
|||||
| Fast-food restaurants |
45 |
32 |
42 |
0.595 |
0.781 |
0.619 |
0.813 |
0.690 |
|||||
| 0.459 |
0.731 |
0.707 |
0.856 |
0.486 |
0.752 |
0.747 |
0.878 |
0.533 |
0.848 |
||||
| Cafés |
62 |
37 |
50 |
0.360 |
0.486 |
0.400 |
0.541 |
0.600 |
|||||
| 0.249 |
0.471 |
0.339 |
0.634 |
0.297 |
0.503 |
0.421 |
0.660 |
0.453 |
0.747 |
||||
| Full-service restaurants | 256 | 205 | 223 | 0.583 |
0.634 |
0.744 |
0.810 |
0.861 |
|||||
| 0.522 | 0.644 | 0.581 | 0.687 | 0.690 | 0.799 | 0.770 | 0.850 | 0.809 | 0.913 | ||||