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Table 2 Summary of construction site-associated clusters in which the first known case was notified from the construction site or from the surrounding areas

From: Construction sites as an important driver of dengue transmission: implications for disease control

  2013 2014 2015 2016
Total no. of clusters 50 88 41 50
No. of clusters that notified the first case from a construction sitea Yes No Yes No Yes No Yes No
35 12 54 28 25 12 31 9
Cluster sizeb ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10
No. of clusters 24 11 9 3 19 35 11 17 6 19 3 9 6 25 3 6
No. of cases 1038 44 298 10 1546 112 836 54 425 59 112 30 231 79 107 25
Average cases per cluster 43.3 4 33.1 3.3 81.4 3.2 76.4 3.2 70.8 3.1 37.3 3.3 38.5 3.2 35.7 4.2
Odds ratioc (95% CI) 0.73 (0.16–3.22) 0.84 (0.33–2.15) 0.95 (0.20–4.68) 2.08 (0.4–10.8)
  1. aNumbers given here are less than the total number of clusters stated because of the non-availability of index case information from certain clusters
  2. b≥10 = major clusters; < 10 = minor clusters
  3. cOdds ratio of construction site-associated clusters expanding into major clusters. CI = confidence interval
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