Skip to main content

Table 1 The proportion (bites per person per night) of mosquitoes caught indoors and during sleeping hours during 1997, 2004 and 2009.

From: Increased proportions of outdoor feeding among residual malaria vector populations following increased use of insecticide-treated nets in rural Tanzania

Year Proportion ± s.e. n/Na, b Odds ratio [95% CI] p value
Endophagy a    
   Anopheles gambiae s.l.   
   1997c 0.585 ± 0.019 394/674 1.00 NA
   2004 0.660 ± 0.006 3,916/5,931 1.113 [0.887 - 1.395] 0.354
   2009 0.575 ± 0.008 2,390/4,160 0.970 [0.770 - 1.221] 0.796
   Overall influence of Year 6,700/10,765 NA 0.248
   Anopheles funestus    
   1997c 0.608 ± 0.025 217/357 1.00 NA
   2004 0.463 ± 0.055 38/82 0.726 [0.461 - 1.142] 0.166
   2009 0.298 ± 0.027 86/288 0.455 [0.323 - 0.641] <0.0001
   Overall influence of Year 341/727 NA 0.0001
Nocturnality b    
   Anopheles gambiae s.l.   
   1997c 0.957 ± 0.008 645/674 1.00 NA
   2004 0.902 ± 0.004 5,347/5,931 0.942 [0.840 - 1.056] 0.305
   2009 0.794 ± 0.006 3,303/4,160 0.829 [0.738 - 0.933] 0.0018
   Overall influence of Year 9,295/10,765 NA <0.0001
   Anopheles funestus    
   1997c 0.980 ± 0.007 350/357 1.00 NA
   2004 0.829 ± 0.042 68/82 0.846 [0.594 - 1.208] 0.354
   2009 0.704 ± 0.027 203/288 0.719 [0.570 - 0.907] 0.0054
   Overall influence of Year 621/727 NA 0.0200
  1. Proportions for each survey period are compared using GLMMs with a binomial distribution, a categorical explanatory variable for study year and a random factor for date.
  2. a Proportion of mosquitoes caught indoors calculated as: (I18→06 hrs)/(I18→06 hrs + O18→06 hrs)
  3. b Proportion of mosquitoes caught during hours when most people are asleep calculated as: (I21→05 hrs + O21→05 hrs)/(I18→06 hrs + O18→06 hrs)
  4. c Formed the reference category for the GLMM