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Table 1 Baseline characteristics in intervention and control shehias, May 2016. Numbers in brackets represent the range between shehias

From: A cluster randomised controlled trial of two rounds of mass drug administration in Zanzibar, a malaria pre-elimination setting—high coverage and safety, but no significant impact on transmission

  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)
  1. 1Households consented/households registered
  2. 2People in consenting households/people registered
  3. 3People present/people registered in consenting households
  4. 4Within 50 m of water assembly
  5. 5Proportion of head of households that are worried that they or a family member will get malaria
  6. 6Occupation only recorded for individuals over the age of 18; other occupations are occupations listed in < 5% of the population
  7. 7This indicator estimates the proportion of the population that could potentially be covered by existing ITNs, assuming that each ITN in a household can be used by two people within that household