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Table 4 Results from the Cox proportional hazard analysis on time to death for X. cheopis and S. fonquerniei

From: Effect of temperature and relative humidity on the development times and survival of Synopsyllus fonquerniei and Xenopsylla cheopis, the flea vectors of plague in Madagascar

  Variable Coefficient 95 % CI P-value Approx. hazard
X. cheopis Temperature 0.01 0.97–1.04 0.56 1.01
Relative humidity 90 % −0.347 0.52–0.94 0.018 0.7
Temperature | Relative humidity −0.016 0.92–1.04 0.57 0.98
S. fonquerniei Temperature −0.016 0.96–1.00 0.062 0.98
Relative humidity 90 % −0.271 0.67–0.86 <0.0001 0.76
Temperature | Relative humidity −0.046 0.93–0.97 0.0003 0.95
  1. Temperature was included as a continuous variable while relative humidity was considered dichotomous. Hazard values are estimated hazard values, calculated by taking the exponential of the coefficient