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Table 4 Descriptive statistics and results of variance ratio (Fmax) test for shigella incidence under various neighborhoods, Nha Trang, Vietnam, 1999–2001. (n = 13565)

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 3 5692 1015 .00 333.30 6.041 197.436 25.397 20 1.571 1.000 1 3.842
200 3 17440 3223 .00 333.30 6.155 74.927 9.638 19 1.587 2.635 2 2.996
300 3 25689 6026 .00 57.14 6.112 38.808 4.992 18 1.605 5.088 3 2.606
400 10 34531 9388 .00 41.67 6.116 28.304 3.641 17 1.624 6.976 4 2.373
500 30 47539 13112 .00 57.47 6.102 22.808 2.934 16 1.644 8.656 5 2.215
600 33 61692 17105 .00 34.36 6.121 18.871 2.427 15 1.667 10.462 6 2.099
700 33 73490 21480 .00 35.46 6.129 16.566 2.131 14 1.692 11.918 7 2.010
800 87 88015 26126 .00 27.47 6.140 14.514 1.867 13 1.721 13.603 8 1.939
900 87 102106 30938 .00 22.87 6.148 13.374 1.720 12 1.753 14.763 9 1.881
1000 87 111244 35834 .00 31.15 6.158 12.651 1.627 11 1.789 15.606 10 1.831
1100 87 121667 40711 .00 19.67 6.137 11.774 1.515 10 1.831 16.769 11 1.789
1200 150 134222 45547 .00 18.28 6.116 11.057 1.422 9 1.881 17.856 12 1.753
1300 425 146883 50410 .00 17.64 6.119 10.536 1.355 8 1.939 18.739 13 1.721
1400 628 152901 55270 .00 16.40 6.135 10.079 1.297 7 2.010 19.589 14 1.692
1500 628 156963 60090 1.21 15.92 6.135 9.588 1.233 6 2.099 20.592 15 1.667
1600 628 161121 64829 1.77 15.92 6.123 9.104 1.171 5 2.215 21.687 16 1.644
1700 628 165020 69457 1.21 15.92 6.129 8.751 1.126 4 2.373 22.562 17 1.624
1800 628 170190 74078 2.73 15.92 6.135 8.411 1.082 3 2.606 23.474 18 1.605
1900 628 177965 78890 2.68 15.92 6.153 8.099 1.042 2 2.996 24.378 19 1.587
2000 628 182551 83821 2.98 15.92 6.171 7.774 1.000 1 3.842 25.397 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.