Reemergence of Yellow Fever in Brazil: The Role of Distinct Landscape Fragmentation Thresholds

Table 1

Association between YF occurrence and forest fragmentation in negative binomial regression.

Xn (independent variables)	Adjusted relative risk	Confidence interval 95%
High forest fragmentation	1.85	1.24–2.75	0.003^1
Partial forest fragmentation	0.81	0.54–1.23	0.23
No vaccination or coverage	1.74	1.25–2.42	0.001^1
Larger municipal population (>100,000 ppl)	1.37	0.93–2.01	0.11
Larger municipal area (>50,000 m^2)	1.61	1.17–2.21	0.004^1

¹Statistically significant variables at the confidence level of 0.05.