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Table 2 Adjusted R squared for multiple linear models using all, uncorrelated, and four available terms

From: Google Health Trends performance reflecting dengue incidence for the Brazilian states

State

Adjusted R squared – All terms model (n)

Adjusted R squared – Uncorrelated terms model (n)

Adjusted R squared – Four terms model (n = 4)

Acré (AC)

0.126 (7)

0.110 (6)

0.092

Alagoas (AL)

0.481 (8)

0.418 (3)

0.470

Amapá (AP)

0.096 (7)

0.099 (6)

0.103

Amazonas (AM)

0.847 (9)

0.590 (2)

0.821

Bahia (BA)

0.647 (11)

0.603 (3)

0.624

Ceará (CE)

0.839 (10)

0.746 (3)

0.812

Distrito Federal (DF)

0.829 (10)

0.433 (2)

0.830

Espírito Santo (ES)

0.725 (10)

0.537 (3)

0.688

Goiás (GO)

0.785 (11)

0.660 (3)

0.768

Maranhão (MA)

0.859 (9)

0.615 (2)

0.856

Mato Grosso (MT)

0.573 (9)

0.453 (3)

0.559

Mato Grosso do Sul (MS)

0.713 (9)

0.583 (3)

0.694

Minas Gerais (MG)

0.923 (12)

0.718 (4)

0.919

Pará (PA)

0.600 (9)

0.277 (2)

0.596

Paraiba (PB)

0.837 (10)

0.683 (3)

0.832

Paraná (PR)

0.845 (12)

0.741 (4)

0.821

Pernambuco (PE)

0.819 (10)

0.714 (2)

0.808

Piauí (PI)

0.553 (8)

0.377 (3)

0.542

Rio de Janeiro (RJ)

0.765 (12)

0.704 (5)

0.744

Rio Grande do Norte (RN)

0.890 (9)

0.706 (2)

0.891

Rio Grande do Sul (RS)

0.804 (12)

0.724 (4)

0.779

Rondônia (RO)

0.568 (9)

0.415 (4)

0.544

Roraima (RR)

0.093 (7)

0.091 (6)

0.058

Santa Catarina (SC)

0.826 (9)

0.788 (2)

0.825

São Paulo (SP)

0.930 (13)

0.861 (6)

0.919

Sergipe (SE)

0.308 (8)

0.216 (3)

0.300

Tocantins (TO)

0.415 (8)

0.342 (4)

0.401

Brazil

0.888 (14)

0.852 (7)

0.850

  1. Different numbers of terms (n) were available depending on the state (e.g., São Paulo vs. Acré) and were correlated considering a state-by-state basis (e.g., Amapá vs. Maranhnão; Additional file 3: terms per state). Four terms model was developed with “dengue”, “dengue sintomas”, “aedes”, and “mosquito”. Bold represent adjusted R squared values above 0.8. Data for Brazil is shown in the last row