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Table 3 Summary of construction site-initiateda clusters based on the scale of construction projectsb

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

  2013 2014 2015 2016
Scale of construction site Large Small Large Small Large Small Large Small
12 18 15 40 13 18 17 11
Cluster sizea ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10
No. of clusters 9 3 12 6 6 9 16 24 2 11 4 14 4 13 4 7
Odds ratiob (95% CI) 1.5 (0.29–7.68) 1.0 (0.30–3.36) 0.64 (0.10–4.14) 0.54 (0.10–2.84)
  1. aConstruction site-initiated clusters are those that notified the first case among construction site workers
  2. bConstructions sites costing ten million Singapore dollars and above were classified as large scale projects
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