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Table 1 Baseline characteristics

From: Evaluating the impact of larviciding with Bti and community education and mobilization as supplementary integrated vector management interventions for malaria control in Kenya and Ethiopia

Characteristics

Overall

Arm 1

Arm 2

Arm 3

Arm 4

Villages per site (houses per village)

16 (10)

4 (10)

4 (10)

4 (10)

4 (10)

Household membership: median number (range; N)a

 Malindi

8 (2–22; 1999)

8 (2–18; 999)

8 (3–19; 600)

7 (3–18; 200)

9 (2–22; 200)

 Nyabondo

4 (1–9; 1546)

5 (1–8; 365)

4 (1–8; 388)

4 (1–8; 374)

4 (1–9; 419)

 Tolay

5 (1–10; 3862)

5 (1–10; 967)

6 (3–10; 1109)

5 (2–9; 958)

4 (1–10; 828)

 Overall

5 (1–22; 7407)

5 (1–18; 2331)

6 (1–19; 2097)

5 (1–18; 1532)

4 (1–22; 1447)

Children characteristicsc

 Median age, years (range; N)

  Malindi

7 (3–15; 1000)

7 (5–13; 500)

7 (6–13; 300)

7 (3–10; 100)

9 (3–15; 100)

  Nyabondo

8 (4–13; 999)

9 (6–13; 200)

9 (4–13; 212)

8 (5–13; 145)

9 (5–13; 153)

  Tolay

12 (4–19; 1600)

12 (4–19; 400)

11 (7–17; 400)

12 (6–16; 400)

12 (5–17; 400)

  Overall

9 (3–19; 3599)

9 (4–19; 1100)

9 (4–17; 912)

10 (3–16; 645)

11 (3–17; 653)

 Baseline malaria infection prevalence  %(95% CI)

  Malindi

5.4 (2.4–12.1)

1.6 (0.6–4.0)

12.0 (4.4–32.6)

4.0 (1.5–10.4)

6.0 (2.8–13.0)

  Nyabondo

24.1 (17.0–34.1)

24.5 (12.1–49.7)

34.9 (25.9–47.0)

17.9 (12.0–26.8)

25.5 (19.6–33.2)

  Tolay

1.4 (0.9–2.2)

2.3 (1.5–3.4)

1.3 (0.3–5.5)

0.8 (0.4–1.4)

1.3 (0.5–3.4)

  Overall

8.8 (5.5–14.0)

6.0 (2.7–13.3)

12.6 (6.6–24.2)

5.1 (2.3–11.4)

7.7 (3.6–16.2)

Entomological characteristicsd

 Baseline mean number of vectors per house per night  %(95% CI)

  Anopheles spp.b

   Malindi

0.11 (0.07–17.9)

0.18 (0.08–0.39)

0.09 (0.03–0.26)

0.04 (0.01–0.19)

0.14 (0.06–0.32)

   Nyabondo

0.02 (0.01–0.05)

0 (0–0.14)

0.04 (0.01–0.13)

0.04 (0.01–0.13)

0.02 (0–0.05)

   Tolay

0.05 (0.02–0.09)

0.05 (0.01–0.20)

0.06 (0.01–0.21)

0.06 (0.02–0.21)

0.03 (0.01–0.18)

   Overall

0.05 (0.04–0.07)

0.06 (0.03–0.11)

0.06 (0.03–0.11)

0.04 (0.02–0.10)

0.05 (0.02–0.09)

  Culex spp.b

   Malindi

0.77 (0.57–1.04)

2.24 (1.16–4.30)

0.29 (0.16–0.52)

0.57 (0.37–0.88)

0.20 (0.10–0.40)

   Nyabondo

0.13 (0.10–0.18)

0.12 (0.06–0.24)

0.12 (0.06–0.23)

0.04 (0.01–0.14)

0.20 (0.13–0.33)

   Tolay

0.06 (0.02–0.11)

0.06 (0.02–0.22)

0.04 (0.01–0.19)

0.04 (0.01–0.19)

0.08 (0.03–0.24)

   Overall

0.26 (0.22–0.32)

0.59 (0.38–0.90)

0.14 (0.09–0.22)

0.19 (0.13–0.28)

0.32 (0.12–0.26)

 Baseline mean number of larvae per dipper  % (95% CI)

  Anopheles spp.

   Malindi

1.03 (0.43–2.42)

0

1.60 (0.64–4.02)

0.09 (0.01–1.30)

0

   Nyabondo

0.11 (0.10–0.12)

0.12 (0.10–0.14)

0.08 (0.07–0.10)

0.11 (0.09–0.12)

0.13 (0.11–0.15)

   Tolay

0.81 (0.67–0.97)

0.58 (0.39–0.87)

0.96 (0.72–1.28)

0.81 (0.54–1.22)

0.83 (0.57–1.20)

Overall

0.14 (0.13–0.14)

0.14 (0.12–0.16)

0.14 (0.12–0.15)

0.12 (0.10–0.13)

0.15 (0.13–0.17)

  Culex spp.

   Malindi

0.53 (0.27–1.05)

0

0.71 (0.30–1.66)

0.57 (0.16–1.99)

0.16 (0.03–0.75)

   Nyabondo

0.19 (0.18–0.20)

0.20 (0.17–0.22)

0.11 (0.10–0.13)

0.23 (0.21–0.25)

0.21 (0.19–0.24)

   Tolay

1.16 (0.99–1.35)

1.37 (1.01–1.87)

0.99 (0.75–1.32)

1.15 (0.72–1.84)

1.14 (0.88–1.48)

   Overall

0.22 (0.20–0.23)

0.23 (0.20–0.27)

0.15 (0.13–0.16)

0.25 (0.23–0.27)

0.25 (0.22–0.27)

  1. aReported household membership is cumulative of the three years since they were not collected during baseline
  2. bAdult vector density was calculated for only those mosquitoes collected using CDC light trap technique
  3. cBaseline malaria prevalence survey was done in October and November 2013 for Malindi site, January 2014 for Nyabondo site and May 2014 for Tolay site
  4. dBaseline entomological survey was done in 2013 for all the three sites
  5. Arm 1 referred to LLINs only; Arm 2 combination of LLINs and Bti; Arm 3 combination of LLINs and CEM; and Arm 4 combination of LLINs, Bti, and CEM
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Malaria Journal

ISSN: 1475-2875

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