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Table 2 Analysis of factors associated with mortality of snails after 25 weeks of follow-up

From: Field-derived Schistosoma mansoni and Biomphalaria pfeifferi in Kenya: a compatible association characterized by lack of strong local adaptation, and presence of some snails able to persistently produce cercariae for over a year

Variables Bivariate analysis Multivariate analysis
HR¥ 95% CI P value Adjusted HR 95% CI P value
Lower Upper Lower Upper
Miracidia         
Negative control 0.35 0.26 0.47 <0.001 0.26 0.19 0.36 <0.001
Miracidia 1 1.00     1.00    
Miracidia 5 1.05 0.85 1.29 0.648 1.11 0.90 1.36 0.336
Miracidia 10 1.36 1.11 1.67 0.003 1.52 1.23 1.87 <0.001
Miracidia 25 1.41 1.15 1.73 0.001 1.55 1.26 1.90 <0.001
Snail source         
Mwea BP 2.19 1.90 2.53 <0.001 2.86 2.45 3.34 <0.001
Asao BP 1.00     1.00    
Parasite source         
Mwea SM 0.98 0.85 1.12 0.737     
Asao SM 1.00        
  1. ¥Hazard Ratio; 95% Confidence Interval.