Table 2

Validation of the nymphal tick immigration index.

Variable

Factor

Coefficient (SE)

Wald z


Index of tick immigration

0.043 (0.004)

10.86***

Province

Newfoundland & Labrador

Reference factor

Saskatchewan

-2.524 (0.254)

-4.12***

Manitoba

1.692 (0.289)

5.85***

Ontario

-1.27 (0.299)

-4.24***

Quebec

-0.405 (0.304)

1.33

New Brunswick

0.482 (0.303)

1.59

Prince Edward Island

3.131 (0.315)

9.93***

Nova Scotia

0.583 (0.349)

1.67

Constant

-9.831 (0.254)

-38.65


*** = P < 0.001

The association of the nymphal tick immigration index with the number of I. scapularis submitted in each Canadian census sub-division in passive surveillance in Canada from 1990 to 2003 was investigated using a multivariable negative binomial regression model. In this model nymphal tick immigration index and Province were explanatory variables, and the natural logarithm of human population was included as an offset.

Ogden et al. International Journal of Health Geographics 2008 7:24   doi:10.1186/1476-072X-7-24

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