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Table 3 Risk factors for An. gambiae s.l. abundance in study children’s sleeping space

From: Risk factors associated with house entry of malaria vectors in an area of Burkina Faso with high, persistent malaria transmission and high insecticide resistance

Variable Mean mosquito density per month (95% CI) Univariate analysis Multivariate analysis
IRR (95% CI) P value IRR (95% CI) P value
Socio-economic status of household head
 Poorest 23.0 (10.0–36.1) 1   1 0.67
 Poor 14.1 (6.8–21.3) 0.78 (0.42–1.45) 0.37 0.73 (0.39–1.37)
 Middle 11.8 (7.7–15.9) 0.91 (0.49–1.69) 0.89 (0.48–1.66)
 Rich 11.5 (7.3–15.8) 0.74 (0.38–1.43) 0.82 (0.42–1.63)
 Richest 12.4 (5.6–19.1) 0.67 (0.30–1.51) 0.73 (0.32–1.65)
ITN use the previous night
 No 7.1 (4.5–9.8) 1   1  
 Yes 15.8 (11.7–19.8) 1.18 (0.62–2.26) 0.62 1.12 (0.56–2.26) 0.75
Use of other personal protection measures (insecticide knockdown spray, mosquito coils, traditional spatial repellent)
 No 15.8 (11.4–20.2) 1   1  
 Yes 9.6 (6.3–13.0) 0.95 (0.56–1.59) 0.83 1.02 (0.58–1.79) 0.95
Number of people sleeping in the same part of the house as the study child
 ≤ 6 13.5 (9.6–17.4) 1   1  
 7–12 17.1 (10.3–23.8) 1.10 (0.65–1.85) 0.73 1.33 (0.75–2.36) 0.52
 > 12 10.4 (7.5–13.3) 0.77 (0.45–1.31) 0.33 0.83 (0.45–1.53)
Roof material of child’s sleeping space
 Non-metal (thatch) 14.3 (8.1–20.6) 1   1  
 Metal 14.4 (10.3–18.4) 0.58 (0.36–0.94) 0.03 0.55 (0.32–0.95) 0.03
Floor material of child’s sleeping space
 Mud 17.4 (11.4–23.3) 1   1  
 Cement/tile 13.3 (9.1–17.5) 0.64 (0.41–0.99) 0.04 0.70 (0.42–1.20) 0.20
Wall material of child’s sleeping space
 Mud 17.4 (11.3–23.4) 1   1  
 Brick 13.6 (8.5–18.6) 1.01 (0.63–1.62) 0.97 1.18 (0.67–2.07) 0.57
 Cement 11.6 (7.0–16.1) 0.82 (0.40–1.69) 0.59 0.98 (0.44–2.18) 0.97
Eaves of child’s sleeping space
 Open 14.9 (9.6–20.3) 1   1  
 Closed 13.8 (9.8–17.7) 1.00 (0.62–1.60) 0.99 0.95 (0.57–1.58) 0.84
Presence of large domestic animals within 5 m of the sleeping space
 Present 14.9 (10.1–19.7) 1   1  
 Absent 12.7 (9.3–16.0) 1.12 (0.76–1.67) 0.56 1.12 (0.74–1.69) 0.60
Distance of sleeping space to positive larval habitat
 < 300 m 9.5 (7.3–11.8) 1   1  
 > 300 m 18.6 (12.4–24.9) 1.54 (1.04–2.30) 0.03 1.43 (0.93–2.19) 0.11