Table 1.
The proportion (bites per person per night) of mosquitoes caught indoors and during sleeping hours during 1997, 2004 and 2009.
| Year | Proportion ± s.e. | n/Na, b | Odds ratio [95% CI] | p value |
|---|---|---|---|---|
| Endophagya | ||||
| 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 | |
| Nocturnalityb | ||||
| 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 | |
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.
a Proportion of mosquitoes caught indoors calculated as: (I18→06 hrs)/(I18→06 hrs + O18→06 hrs)
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)
c Formed the reference category for the GLMM