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Table 3 Risk factors associated with vector density in the univariate and multivariate models

From: Risk factors for malaria infection prevalence and household vector density between mass distribution campaigns of long-lasting insecticidal nets in North-western Tanzania

  Number of HH Indoor vector density Univariate Multivariate
IRR 96% CI p-value IRR 96% CI p-value
Altitude (metres)
 1133–1242 192 63.2 1    1   
 1243–1302 191 22.6 0.63 0.49–0.80  < 0.001 0.58 0.46–0.74  < 0.001
 1303–1373 192 6.8 0.51 0.40–0.66  < 0.001 0.44 0.33–0.58  < 0.001
 1374–1651 191 5.7 0.39 0.29–0.51  < 0.001 0.35 0.27–0.46  < 0.001
Wind during collection
 None/light 433 28.2 1    1   
 Moderate/strong 335 19.9 0.77 0.64–0.93 0.007 0.69 0.57–0.83  < 0.001
Livestock
 No 267 17.5 1    1   
 Yes 502 28.3 1.13 0.95–1.35 0.159 1.35 1.12–1.62 0.001
Improved housing structure
 No 579 29.3 1    1   
 Yes 183 10.1 0.78 0.63–0.95 0.016 0.83 0.67–1.02 0.072
Household using at least 1 LLIN
 No 264 22.9 1    1   
 Yes 505 25.4 0.79 0.66–0.93 0.006 0.78 0.66–0.92 0.004
Number of rooms 770 24.9 0.89 0.84–095  < 0.001 0.90 0.84–0.96 0.001
Household cooks inside the house
 No 620 23.3 1      
 Yes 149 29.6 1.31 1.07–1.59 0.010    
Total time house has been sprayed 756 24.9 0.94 0.90–0.99 0.011    
Animal inside the house
 No 308 29.2 1      
 Yes 196 26.5 1.01 0.82–1.25 0.933    
Rain during collection
 None 435 23.7 1      
 Light 164 37.1 0.98 0.78–1.24 0.894    
 Heavy 169 14.5 1.15 0.92–1.44 0.234    
Eaves of the house
 Closed 324 22.9 1      
 Open 445 25.7 1.17 0.99–1.38 0.071