Table 2.
Accuracy statistics of D&B and InfoUSA data compared to field census data for each community food access measure
| +Agreea (count) |
−Agreeb (count) |
Disagree (count) |
Concordancec(%) | Sensitivity (95% CI %) |
PPV (95% CI %) |
Specificity (95% CI %) |
NPV (95% CI %) |
|
|---|---|---|---|---|---|---|---|---|
| Food Desert Tracts (Field Census: N=14/169) | ||||||||
| D&B | 7 | 151 | 11 | 93.5 | 50.0 (24.0, 76.0) | 63.6 (31.6, 87.6) | 97.4 (93.1, 99.2) | 95.6 (90.7, 98.0) |
| InfoUSA | 9 | 149 | 11 | 93.5 | 64.3 (35.6, 86.0) | 60.0 (32.9, 82.5) | 96.1 (91.4, 98.4) | 96.8 (92.2, 98.8) |
| Non-Healthier Food Retail Tracts (Field Census: N=49/169) | ||||||||
| D&B | 42 | 111 | 16 | 90.5 | 85.7 (72.1, 93.6) | 82.4 (68.6, 91.1) | 92.5 (85.8, 96.3) | 94.1 (87.7, 97.4) |
| InfoUSA | 39 | 109 | 21 | 87.6 | 79.6 (65.2, 89.3) | 78.0 (63.7, 88.0) | 90.8 (83.8, 95.1) | 91.6 (84.7, 95.7) |
a
“+Agree” means the agreement on low food access areas.
b
“−Agree” means the agreement on non-low food access areas.
c
Concordance = (“+Agree” + “−Agree”)/ (“+Agree” + “−Agree” + “Disagree”)