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Table 1 Descriptive statistics and results of variance ratio (Fmax) test for the Vibrio parahaemolyticus incidence under various neighborhoods, Khanh Hoa Province, Vietnam, 1997–99. (n = 29,211)

From: Neighborhood size and local geographic variation of health and social determinants

r Population size Incidence Rate/10000 Population Upper Fmax Test Lower Fmax Test
  Min Max Mean Min Max Mean Variance Fmax1 DF1 * CV1 ** Fmax2 DF2 * CV2 **
100 1 1779 158 .00 1429.00 4.612 646.023 49.116 20 1.571 1.000 1 3.842
200 1 5143 492 .00 370.40 4.451 195.453 14.860 19 1.587 3.305 2 2.996
300 1 7372 914 .00 208.30 4.538 108.599 8.257 18 1.604 5.949 3 2.605
400 1 9252 1416 .00 161.30 4.533 73.509 5.589 17 1.623 8.788 4 2.372
500 3 12265 1971 .00 144.90 4.494 52.889 4.021 16 1.644 12.215 5 2.214
600 4 15784 2571 .00 227.30 4.486 42.481 3.230 15 1.667 15.207 6 2.099
700 4 19178 3236 .00 92.59 4.441 33.666 2.560 14 1.692 19.189 7 2.010
800 4 21949 3953 .00 52.91 4.434 28.671 2.180 13 1.720 22.532 8 1.939
900 4 24982 4711 .00 38.46 4.446 25.298 1.923 12 1.753 25.537 9 1.880
1000 4 26772 5508 .00 35.71 4.463 22.733 1.728 11 1.789 28.418 10 1.831
1100 6 28821 6324 .00 36.50 4.4939 20.647 1.570 10 1.831 31.289 11 1.789
1200 25 31691 7160 .00 36.50 4.5101 18.831 1.432 9 1.880 34.306 12 1.753
1300 50 34877 8029 .00 46.51 4.5099 17.453 1.327 8 1.939 37.015 13 1.720
1400 63 36311 8921 .00 37.17 4.5184 16.444 1.250 7 2.010 39.286 14 1.692
1500 63 37334 9832 .00 31.65 4.5266 15.655 1.190 6 2.099 41.266 15 1.667
1600 63 38471 10760 .00 28.33 4.5429 15.116 1.149 5 2.214 42.738 16 1.644
1700 63 39259 11693 .00 28.17 4.5510 14.593 1.109 4 2.372 44.269 17 1.623
1800 63 40278 12651 .00 27.70 4.5727 14.114 1.073 3 2.605 45.772 18 1.604
1900 63 41457 13657 .00 26.32 4.5990 13.639 1.037 2 2.996 47.366 19 1.587
2000 63 42492 14703 .00 26.32 4.6152 13.153 1.000 1 3.842 49.116 20 1.571
  1. r = size of neighborhood in meter radius
  2. * DF = degrees of freedom
  3. **CV1 and CV2 = critical values at 95% confidence level for Upper Fmax and Lower Fmax respectively Bold figures in Fmax1 and Fmax2 are the upper and lower limit of optimal neighborhoods, and the bold figure in "r" column is the choice of optimal neighborhood size.