Table 4.

Results from model selection analysis to explain variation in I. scapularis infection prevalence with B. burgdorferi as a function of land-use characteristics among 13 sites in central Virginia. All variables were significant at p < 0.01 but the five-parameter model indicated at step four was the model associated with the lowest AICc. Variable descriptions are found in Table 1.

Step	Description	Effects	Chi-Square	Pr > ChiSq	AICc
0	Initial Model	1			19.78
1	ONE_NP entered	2	1.73 × 102	<0.0001	−285.58
2	TEN_TE entered	3	1.00 × 1011	<0.0001	−182.79
3	TEN_NP entered	4	2.70 × 1013	<0.0001	−237.55
4	elevation entered	5	2.20 × 1011	<0.0001	−490.21
5	TEN_NP removed	4	3.39 × 10−2	0.8538	−459.28