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Table 2 Incidence rate ratios (IRR), Odds ratios (OR) and 95% confidence intervals (CI) from the zero inflated- negative binomial regression model

From: Environmental correlates of crimean-congo haemorrhagic fever incidence in Bulgaria

A - Negative binomial regression for counts of CCHF cases IRR* 95%CI P-value
Mean temperature (°C) 1.055 (1.048; 1.062) < 0.001
Mean NDVI 1.018 (1.014; 1.022) < 0.001
Habitat fragmentation level    
low 1   
medium 1.402 (1.120; 1.754) 0.003
high 1.558 (1.137; 2.137) 0.006
Proportion of areas covered by grasslands, scrub and herbaceous vegetation    
low 1   
medium 3.994 (1.812; 8.803) 0.001
high 4.260 (1.960; 9.260) < 0.001
Cattle density 0.986 (0.966; 1.006) 0.160
Sheep density 1.001 (0.992; 1.010) 0.853
Human density 0.815 (0.521; 1.278) 0.374
B - Logistic regression for excess of zero CCHF cases OR* 95%CI P-value
Mean temperature (°C) in October-November of the previous year 1.129 (1.015; 1.257) 0.026
  1. *Adjusted by calendar year.