Table 2 Spearman’s rho correlation coefficients for diseases notifications-search metrics for the period 2009–13.

From: Disease surveillance based on Internet-based linear models: an Australian case study of previously unmodeled infection diseases

Disease

Top ranked search term

ACT

NSW

NT

QLD

SA

TAS

VIC

WA

AUS

p-value

Gonococcal infection

discharge

 

0.795

−0.028

0.298

0.205

 

0.556

0.265

0.786

<0.00001

Varicella zoster (Shingles)

diarrhea

   

−0.400

0.546

 

0.578

0.633

0.762

<0.00001

Pneumococcal disease (invasive)

bronchitis

 

0.558

 

0.338

  

0.402

 

0.753

<0.00001

Ross River virus infection

"ross river"

 

0.456

 

0.082

    

0.742

<0.00001

Pertussis

whooping

 

0.661

 

0.489

  

0.525

0.700

0.651

<0.00001

Chlamydial infection

blood test

 

0.540

0.038

0.208

0.433

 

0.390

0.557

0.634

<0.00001

Varicella zoster (unspecified)

blood test

  

−0.023

0.297

−0.404

 

0.316

0.400

0.628

<0.00001

Varicella zoster (Chickenpox)

conjunctivitis

   

0.071

  

0.380

 

0.624

<0.00001

Cryptosporidiosis

ross river virus

        

0.569

<0.00001

Barmah Forest virus infection

ross river virus

        

0.539

<0.00001

Dengue virus infection

dengue

−0.036

0.337

 

0.508

  

0.569

 

0.507

<0.00001

Influenza (laboratory confirmed)

flu symptoms

0.344

0.290

 

0.589

  

0.485

 

0.423

<0.00001

Leptospirosis

ross river

 

0.110

 

0.059

    

0.405

<0.00001

Measles

measles

 

0.198

 

0.263

  

0.119

 

0.367

<0.00001

Hepatitis C (unspecified)

hepatitis

 

0.193

 

0.116

−0.149

 

0.142

−0.035

0.297

<0.00001

Hepatitis A

hepatitis a

 

−0.167

      

0.293

<0.00001

Murray Valley encephalitis virus infection

murray valley encephalitis

        

0.265

<0.0001

Legionellosis

legionnaires

    

0.108

   

0.237

<0.0001

Hepatitis B

hepatitis

 

0.183

 

0.097

−0.060

 

0.067

−0.007

0.230

<0.001

Meningococcal disease (invasive)

rulide

        

0.222

<0.001

Chikungunya virus infection

dengue

 

−0.023

 

0.104

  

0.140

 

0.194

0.0013

Hepatitis B (newly acquired)

hepatitis

 

−0.116

 

−0.014

−0.064

 

0.157

−0.037

0.123

0.0333

Listeriosis

listeria

−0.010

       

0.091

0.0906

Botulism

botulism

        

0.053

0.2299

  1. The table only contains the search term with the highest degree of correlation for each disease; see supplementary material for a full list of search terms and correlation coefficients. p-values relate to correlations at national level. Empty cells indicate that Google Trends data were not available.
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