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Table 1 Bi-directional cross-correlation coefficients displaying the linear association between Google Trends records of Chikungunya and Zika and registered febrile cases in 2014–2016

From: Investigating the utility of Google trends for Zika and Chikungunya surveillance in Venezuela

Disease

Lag in weeks

 

−3

−2

−1

0

+ 1

+ 2

+ 3

Chikungunya

0.564

0.677

0.745

0.784

0.734

0.666

0.585

Zika

0.618

0.660

0.671

0.705

0.754

0.753

0.710