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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.