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Table 2 Data on the performance of the different indicators in discriminating suitable and non-suitable climate for Ae. albopictus according to surveillance data collected in the United States from 1999-2011

From: Recent and projected future climatic suitability of North America for the Asian tiger mosquito Aedes albopictus

Indicator Cut-off Sensitivity (%) Specificity (%) % Correctly classified
   A B C A B C A B C
OW 0 versus ≥1 90.51 90.25 93.18 90.15 90.41 45.83 90.19 90.39 68.83
  ≤ 1 versus ≥2 83.28 84.12 85.43 92.35 92.59 58.57 91.31 91.61 71.61
  ≤ 2 versus ≥3 72.89 71.59 75.35 93.83 94.12 65.45 91.43 91.52 70.26
  AUC A = 0.912 (95% CI 0.900-0.9240), B = 0.912 (95% CI 0.895-929), C = 0.742 (95% CI = 0.718-0.766)
OWAT 0 versus ≥1 90.51 90.25 93.18 91.32 91.57 39.97 91.22 91.42 65.81
  ≤ 1 versus ≥2 90.51 90.25 93.18 91.59 91.86 41.29 91.47 91.68 66.49
  ≤ 2 versus ≥3 90.21 89.97 92.71 92.18 92.52 43.19 91.95 92.22 67.24
  ≤ 3 versus ≥4 89.31 88.86 91.94 92.60 92.95 45.53 92.23 92.48 69.07
  AUC A = 0.914 (95% CI 0.903-0.926), B = 0.915 (95% CI 0.898-0.931), C = 0.688 (95% CI 0.666-0.709)
SIG Cut point 64.64 90.06 89.14 91.47 78.75 80.13 41.29 80.05 81.17 65.66
  Cut point 66.69 84.49 83.29 88.84 92.18 92.88 45.10 91.29 91.77 66.34
  AUC A = 0.925 (95% CI 0.916-0.934), B = 0.925 (95% CI 0.913-0.936), C = 0.709 (95% CI 0.681-0.737)
  1. Values indicated by the letter A were obtained using data obtained from the full grid of climate data, Values indicated by the letter B were obtained using a reduced database of grid cells with the same sample size (3112) as the numbers of United States counties in the original surveillance data. Values indicated by the letter C were obtained using only data from south of 40°N and east of 105°W. AUC = Area under the Receiver Operator Characteristic curve; CI = Confidence interval.