Table 7 |
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|
Sensitivity and positive predictive value (PPV) of the flexible and cylindrical space-time scan statistics. |
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|
zip codes |
population |
|||||
|
traditional power |
sensitivity (%) |
PPV (%) |
sensitivity (%) |
PPV (%) |
||
|
|
||||||
|
Cluster A; s* = 1; high risk |
||||||
|
Day 31 |
flexible (K = 20) |
|||||
|
cylindrical (K = 20) |
0.860 |
85.30 |
89.45 |
85.30 |
91.50 |
|
|
cylindrical (50% pop) |
0.862 |
85.90 |
88.79 |
85.90 |
90.84 |
|
|
Day 32 |
flexible (K = 20) |
0.988 |
98.80 |
84.50 |
98.80 |
87.80 |
|
cylindrical (K = 20) |
0.996 |
99.50 |
97.44 |
99.50 |
98.18 |
|
|
cylindrical (50% pop) |
0.996 |
99.50 |
97.33 |
99.50 |
98.08 |
|
|
Day 33 |
flexible (K = 20) |
0.999 |
99.90 |
96.27 |
99.90 |
97.32 |
|
cylindrical (K = 20) |
0.999 |
99.90 |
99.48 |
99.90 |
99.65 |
|
|
cylindrical (50% pop) |
0.999 |
99.90 |
99.48 |
99.90 |
99.65 |
|
|
Cluster A5; s* = 5; high risk |
||||||
|
Day 31 |
flexible (K = 20) |
0.797 |
66.08 |
55.93 |
67.29 |
63.00 |
|
cylindrical (K = 20) |
0.850 |
69.62 |
80.35 |
71.65 |
84.21 |
|
|
cylindrical (50% pop) |
0.847 |
70.62 |
78.17 |
71.62 |
82.02 |
|
|
Day 32 |
flexible (K = 20) |
0.994 |
92.22 |
70.17 |
92.94 |
76.73 |
|
cylindrical (K = 20) |
0.996 |
88.78 |
85.14 |
90.86 |
89.41 |
|
|
cylindrical (50% pop) |
0.996 |
88.96 |
84.81 |
91.05 |
89.11 |
|
|
Day 33 |
flexible (K = 20) |
1.000 |
95.88 |
80.02 |
96.64 |
85.25 |
|
cylindrical (K = 20) |
1.000 |
91.42 |
87.32 |
93.66 |
91.67 |
|
|
cylindrical (50% pop) |
1.000 |
91.42 |
87.30 |
93.66 |
91.65 |
|
|
The Rockaways; s* = 5; high risk |
||||||
|
Day 31 |
flexible (K = 20) |
0.769 |
60.68 |
72.09 |
69.04 |
73.58 |
|
cylindrical (K = 20) |
0.855 |
62.32 |
91.63 |
74.45 |
91.76 |
|
|
cylindrical (50% pop) |
0.840 |
61.40 |
91.04 |
73.65 |
91.15 |
|
|
Day 32 |
flexible (K = 20) |
0.992 |
86.76 |
87.36 |
94.17 |
89.86 |
|
cylindrical (K = 20) |
0.997 |
77.00 |
96.84 |
92.75 |
97.46 |
|
|
cylindrical (50% pop) |
0.997 |
77.00 |
96.84 |
92.75 |
97.46 |
|
|
Day 33 |
flexible (K = 20) |
1.000 |
92.16 |
93.81 |
97.15 |
95.97 |
|
cylindrical (K = 20) |
1.000 |
78.50 |
98.06 |
94.51 |
98.59 |
|
|
cylindrical (50% pop) |
1.000 |
78.50 |
98.06 |
94.51 |
98.59 |
|
|
Hudson River, s* = 20; high risk |
||||||
|
Day 31 |
flexible (K = 20) |
0.656 |
20.07 |
64.99 |
26.00 |
69.72 |
|
cylindrical (K = 20) |
0.597 |
14.23 |
61.10 |
18.16 |
65.18 |
|
|
cylindrical (50% pop) |
0.632 |
26.15 |
50.70 |
31.26 |
53.71 |
|
|
Day 32 |
flexible (K = 20) |
0.964 |
32.17 |
73.59 |
41.81 |
78.36 |
|
cylindrical (K = 20) |
0.933 |
24.13 |
61.55 |
31.58 |
66.69 |
|
|
cylindrical (50% pop) |
0.949 |
42.90 |
50.27 |
51.50 |
53.96 |
|
|
Day 33 |
flexible (K = 20) |
0.998 |
34.91 |
79.39 |
46.27 |
84.17 |
|
cylindrical (K = 20) |
0.994 |
27.23 |
60.56 |
36.75 |
66.20 |
|
|
cylindrical (50% pop) |
0.995 |
48.14 |
47.34 |
58.54 |
51.34 |
|
|
|
||||||
|
Takahashi et al. International Journal of Health Geographics 2008 7:14 doi:10.1186/1476-072X-7-14 |
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