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Table 3 Statistically significant spatio-temporal clusters of A(H7N9) human infections in China identified by use of the space-time permutation scan test with 5-days scanning unit (phase II)

From: Spatio-temporal pattern analysis for evaluation of the spread of human infections with avian influenza A(H7N9) virus in China, 2013–2014

Cluster Most likely cluster Secondary cluster 2 Secondary cluster 3
Location Ningbo, Shaoxing, Jiaxing, Zhuji, Hangzhou, Shanghai, Yiwu, Huzhou, Suzhou, Taizhou Fuyang, Lu’an, Hefei, Xuzhou, Anqing, Tongling, Ma’anshan, Xuancheng, Nanjing, Huaian, Zhenjiang, Taian, Taizhou, Yancheng, Changzhou, Wuxi, Huangshan, Leping Zhaoqing, Foshan, Jiangmen, Guangzhou
Province or region Zhejiang, Jiangsu, Shanghai Anhui, Jiangsu, Shandong, Jiangxi Guangdong
Coordinates 29.86 N, 121.56 E 32.89 N, 115.81 E 23.06 N, 112.45 E
Radius (km) 194.90 km 453.14 km 80.49 km
Time frame 2014 1/12–1/31 2014 4/22–5/31 2014 2/16–3/2
Duration (days) 19 39 14
Oa 61 14 19
Eb 33.80 3.58 6.53
O / Ec 1.80 3.91 2.91
LLRd / Test statistic 10.292886 8.856121 8.095875
P-valuee 0.0016 0.011 0.028
  1. aNumber of cases observed per cluster
  2. bNumber of cases expected per cluster
  3. cObserved / Expected, Observed-to-expected ratio
  4. dLog Likelihood ratio
  5. eStatistical significance was evaluated using Monte Carlo hypothesis testing