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Table 1 Baseline characteristics in intervention and control shehias, May 2016. Numbers in brackets represent the range between shehias
| Intervention | Control | |
|---|---|---|
| Survey characteristics | ||
| Date of survey | 30 April–7 May, 2016 | 9 May–17 May, 2016 |
| Number of households registered | 2682 (219–453) | 3006 (208–644) |
| Household participation rate1 (%) | 96.1 (91.4–99.5) | 92.8 (87.9–95.4) |
| Number people registered (all households) | 10,944 (926–1821) | 12,307 (935–2542) |
| Number people in consenting households (N; %2) | 10,683; 97.6% | 11,813; 96.0% |
| Proportion present at time of survey3 (%) | 77.2 (64.9–84.6) | 74.6% (61.8–82.8) |
| Household characteristics | ||
| House type | ||
| Temporary (% palm leaf structure) | 7.0 (2.9–11.3) | 4.1 (0.0–11.6) |
| Semi-permanent (% mud and sticks/stones/coral) | 24.3 (12.0–50.7) | 26.0 (11.4–40.2) |
| Permanent (% brick/stone) | 68.7 (43.4–84.1) | 69.9 (48.2–88.6) |
| Households in proximity to breeding site4 (%) | 6.8 (1.7–13.6) | 5.8 (0.4–18.4) |
| Head of households worried about malaria5 (%) | 54.0 (44.5–60.3) | 59.2 (49.8–69.4) |
| Participant characteristics | ||
| Median age [interquartile range] | 19 [8–35] | 19 [8–35] |
| Permanent resident of household (%) | 98.1 (96.8–98.7) | 98.3 (97.6–99.7) |
| Percent female (%) | 51.5 (49.5–54.2) | 51.7 (49.8–55.3) |
| Main occupation6 | ||
| Farming (%) | 37.7 (10.7–54.5) | 42.1 (15.4–60.6) |
| Fishing (%) | 12.3 (0.5–33.2) | 12.7 (0.4–30.8) |
| Other (%) | 27.7 (20.2–36.7) | 25.5 (11.6–44.0) |
| Unemployed (%) | 24.4 (16.6–30.0) | 22.9 (15.0–30.2) |
| Overnight travel within Zanzibar in last month (%) | 3.4 (2.1–5.0) | 2.9 (1.1–4.3) |
| Overnight travel outside Zanzibar in last month (%) | 0.5 (0.0–1.0) | 0.6 (0.1–1.2) |
| Overnight travel outside Zanzibar in last 6 months (%) | 1.4 (0.4–2.8) | 1.5 (0.6–2.3) |
| Vector control coverage | ||
| Households sprayed in the last 12 months (%) | 84.7 (64.3–94.2) | 85.1 (77.3–93.8) |
| Households with at least one mosquito net (%) | 85.6 (72.6–97.4) | 82.3 (72.0–93.4) |
| Households with at least one mosquito net per sleeping space (%) | 67.0 (45.5–81.6) | 62.6 (54.0–75.3) |
| People with access to a bed net7 (%) | 74.5 (56.6–90.6) | 71.1 (59.1–80.6) |
| People who slept under a mosquito net last night (%) | 74.6 (53.9–92.0) | 70.2 (55.8–79.6) |
| Children under five who slept under a mosquito net last night (%) | 79.6 (61.5–96.6) | 78.8 (62.7–87.4) |
| Malaria transmission indicators | ||
| Annual parasite index in 2015 (cases/1000 people) | 14.4 (11.1–22.4) | 12.7 (8.3–32.8) |
| Malaria prevalence at baseline (%) | 0.8 (0.0–1.6) | 2.5 (0.7–4.5) |
