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Table 1 Case details of major (≥10 cases) and minor (< 10 cases) clusters: Overall and construction site-associated clusters

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

  2013 2014 2015 2016
Total no. of clusters 1705 1823 1319 1721
No. of clusters based on sizea ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10
199 (11.7%) 1506 (88.3%) 133 (7.3%) 1690 (92.7%) 108 (8.2%) 1211 (91.8%) 102 (5.9%) 1619 (94.1%)
Average cases per cluster 30.7 3.3 39.7 2.9 31.3 2.9 26.4 3.0
Construction site-associated clusters Yes No Yes No Yes No Yes No
50 (2.9%) 1655 (97.1%) 88 (4.8%) 1735 (95.2%) 41 (3.1%) 1278 (96.9%) 50 (2.9%) 1671 (97.1%)
Cluster sizea ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10 ≥10 < 10
No. of clusters 33 17 166 1489 32 56 101 1634 9 32 99 1179 10 40 92 1579
No. of cases 1336 62 4777 4893 2473 216 2805 4707 537 102 2845 3391 360 135 2331 4661
Average cases per cluster 40.5 3.6 28.7 3.3 77.1 3.9 27.8 2.9 59.7 3.2 28.7 2.9 36 3.4 25.3 3.0
Odds ratiob (95% CI) 17.4 (9.49–31.9) 9.24 (5.73–14.9) 3.35 (1.55–7.21) 4.29 (2.07–8.85)
  1. a≥10 = major clusters; < 10 = minor clusters
  2. bOdds ratio of construction site-associated clusters expanding into major clusters. CI confidence interval
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