Skip to main content

Table 4 Results of zero-inflated negative binomial regression for the relationship between climatic variables and autochthonous malaria reported in Jazan region between 2010 and 2017

From: Residual malaria in Jazan region, southwestern Saudi Arabia: the situation, challenges and climatic drivers of autochthonous malaria

Variables Count model (negative binomial coefficients) Zero-inflated model (logit coefficients)
  β SE 95% CI P % change β SE 95% CI P OR
Model A
 Intercept 16.593 3.809 9.023, 24.163 < 0.001* − 21.481 8.775 − 38.919, − 4.043 0.014
 Maximum temperature (lag 1) − 0.095 0.099 − 0.292, 0.102 0.336 − 9.06 − 0.736 0.351 − 1.434, − 0.038 0.036* 0.48
 Minimum temperature (lag 1) − 0.243 0.073 − 0.388, − 0.098 0.001* − 21.57 0.704 0.258 0.191, 1.217 0.006* 2.02
 Average temperature (lag 0) − 0.157 0.078 − 0.312, − 0.002 0.045* − 14.53 0.853 0.351 0.155, 1.551 0.015* 2.35
 Atmospheric pressure (lag 1) − 0.131 0.182 − 0.493, 0.231 0.130 − 12.28 0.196 0.638 − 1.072, 1.464 0.758 1.22
 Wind speed (lag 1) − 0.145 0.141 − 0.425, 0.135 0.301 − 11.50 0.651 0.483 − 0.309, 1.611 0.177 1.92
 No. of sandstorms (lag 0) − 0.051 0.140 − 0.329, 0.227 0.714 − 4.97 − 0.366 0.351 − 1.064, 0.332 0.298 0.69
 No. of dust haze events (lag 2) 0.001 0.127 − 0.251, 0.253 0.999 0.10 0.308 0.322 − 0.332, 0.948 0.339 1.36
Model B
 Intercept 1.683 3.260 − 4.795, 8.162 0.817 −  35.394 13.098 9.364, 61.424 0.078 − 
 Maximum temperature (lag 1) − 0.016 0.135 − 0.284, 0.252 0.907 − 1.56 − 0.603 0.273 − 1.146, − 0.061 0.027* 0.55
 Average temperature (lag 0) − 0.152 0.087 − 0.325, 0.021 0.079 − 14.10 0.796 0.346 0.108, 1.484 0.021* 2.22
 Relative humidity (lag 1) 0.097 0.047 − 0.004, 0.190 0.047* 10.19 − 0.393 0.145 − 0.681, − 0.105 0.007* 0.68
 Atmospheric pressure (lag 1) 0.246 0.474 − 0.696, 1.188 0.603 27.94 − 1.830 1.349 − 4.511, 0.851 0.175 0.16
 Wind speed (lag 1) − 0.053 0.160 − 0.371, 0.265 0.742 − 5.16 0.261 0.518 − 0.768, 1.290 0.615 1.30
 Number of sandstorms (lag 0) − 0.017 0.169 − 0.353, 0.319 0.920 − 1.69 − 0.484 0.428 − 1.335, 0.367 0.258 0.62
 Number of dust haze events (lag 2) − 0.079 0.158 − 0.393, 0.235 0.617 − 7.60 0.530 0.423 − 0.311, 1.371 0.211 1.70
Model C
 Intercept 12.388 1.726 8.960, 15.816 < 0.001* −  − 14.350 4.500 − 23.293, − 5.407 0.001
 Maximum temperature (lag 1) − 0.090 0.066 − 0.221, 0.041 0.171 − 8.61 − 0.090 0.066 − 0.221, 0.041 0.104 0.91
 Average temperature (lag 0) − 0.194 0.072 − 0.337, − 0.051 0.007* − 17.63 0.631 0.212 0.210, 1.052 0.003* 1.88
 Relative humidity (lag 1) 0.059 0.039 − 0.018, 0.136 0.134 6.08 − 0.347 0.173 − 0.691, − 0.003 0.045* 0.71
  1. β: Regression coefficient; SE: Standard error of β; CI: Confidence interval for β
  2. Computed as (eβ − 1)*100
  3. Computed as (eβ)
  4. * Significant association (P < 0.05)