Skip to main content

Table 2 Summary of p -values for tests of spatial and space-time clustering and clusters, and epidemiological measures of association between occurrence of PRRSV RFLP types and time, space, and ownership in Ontario from 2004–2007

From: Spatial and temporal patterns of porcine reproductive and respiratory syndrome virus (PRRSV) genotypes in Ontario, Canada, 2004–2007

 

Wild-type viruses

Vaccine-type viruses

RFLP type

1-3-4

1-18-4

1-8-2

1-8-4

2-5-2

1-4-2

 

Tests and functions for spatial and space-time clusters and clustering (p-values)

D-function

0.06

0.18

0.35

0.37

0.94

0.11

Space-time K- function

0.63

0.06

0.10

0.86

0.005

0.48

Spatial scan statistica (Bernoulli model)

0.012

0.41

0.22

0.32

0.09

0.60

Spatial scan statistica (Space-time perm. mod.)

0.13

0.08

0.72

0.99

0.04

0.17

 

Univariable generalized additive models (p-value and OR b for individual ownerships)

Space (x,y) (p-value)

0.81

0.01

0.71

0.40

0.51

0.94

Time (days) (p-value)

0.008

0.20

0.80

0.62

0.61

0.06

Ownership

3: OR = 4.1

1: OR = 4.9

2: OR = 4.8

2: OR = 12.1

1: OR = 5.9

NSc

Baseline = small owners

4: OR = 7.3

3: OR = 7.4

  

6: OR = 11.7

 
 

5: OR = 12.2

5: OR = 6.7

    
 

Final multivariable generalized additive models (p-value and OR b for individual ownerships)

Space (x,y) (p-value)

NId

0.007

NI

NI

NI

NI

Time (days) (p-value)

0.008

NI

NI

NI

NI

0.059

Ownership

3: OR = 6.2

1: OR = 5.7

2: OR = 4.8

2: OR = 12.1

1: OR = 5.9

NI

Baseline = small owners

 

3: OR = 10.3

  

6: OR = 11.7

 
  

5: OR = 15.5

    
  1. ap-values obtained for the primary spatial and space-time cluster detected by this method.
  2. bOR = Odds Ratio for individual ownerships using small owners as the baseline. Only comparisons with p < 0.05 are listed in the table. Number before OR corresponds to the ownership code as listed in Table 1.
  3. cNS = No comparisons were significant at p < 0.05.
  4. dNI = Not included in the final model.
  5. Boldface values have p-values < 0.05.