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Table 2 Results of two-sample and multi-sample statistical comparisons of An. stephensi survival times.

From: Anopheles mortality is both age- and Plasmodium-density dependent: implications for malaria transmission

Experiment (Date) Mosquito Group (Ookinete density per μl of blood) Test Statistic Statistical Results
1    100 400 2,000  
(August 2007) 0 Hazard Ratio (HR) 1.1413 1.4261 2.2004  
   HR C.I. (0.87, 1.50) (1.17, 1.74) (1.77, 2.74)  
   Mantel-Cox 0.9124 12.4278 52.6238  
   P-value 0.3395 0.0004* <0.0001*  
  100 HR   1.4003 1.9702  
   HR C.I.   (1.09, 1.80) (1.52, 2.55)  
   Mantel-Cox   6.9297 27.2606  
   P-value   0.0085* <0.0001*  
  400 HR    1.4023  
   HR C.I.    (1.16, 1.70)  
   Mantel-Cox    12.2886  
   P-value    0.0005*  
  All 4 Groups Log-rank     55.89
   P-value     <0.0001*
2    100 400 2,000  
(April 2008) 0 HR 0.7312 1.1786 1.7447  
   HR C.I. (0.58, 0.92) (0.97, 1.44) (1.38, 2.20)  
   Mantel-Cox 7.0017 2.6747 22.3554  
   P-value 0.0081* 0.1020 <0.0001*  
  100 HR   1.6063 2.1607  
   HR C.I.   (1.27, 2.03) (1.65, 2.82)  
   Mantel-Cox   15.7261 33.6528  
   P-value   <0.0001* <0.0001*  
  400 HR    1.3186  
   HR C.I.    (1.05, 1.66)  
   Mantel-Cox    5.6392  
   P-value    0.0176*  
  All 4 Groups Log-rank     31.20
   P-value     <0.0001*
3    50 250 1,000  
(July 2008) 0 HR 2.2198 2.1914 2.5451  
   HR C.I. (1.77, 2.79) (1.76, 2.73) (2.06, 3.15)  
   Mantel-Cox 49.5610 51.1026 78.9376  
   P-value <0.0001* <0.0001* <0.0001*  
  50 HR   1.0144 1.1677  
   HR C.I.   (0.86, 1.20) (0.99, 1.37)  
   Mantel-Cox   0.0283 3.7481  
   P-value   0.8664 0.0529  
  250 HR    1.1543  
   HR C.I.    (0.99, 1.34)  
   Mantel-Cox    3.5264  
   P-value    0.0604  
  All 4 Groups Log-rank     36.61
   P-value     <0.0001*
  1. * Significant at 5% level
  2. C.I., 95% confidence interval.