Table 2.
Time-Series Linear Regression Analysis for Weekly Number of SARS-CoV-2 Tests in the USA and Italy with Google Trends Scores for Suggestive Symptoms
| USA | Italy | ||||||
|---|---|---|---|---|---|---|---|
| Variable | Coefficient | SE | P Value | Variable | Coefficient | SE | P Value |
| Month | 371514.413 | 37173.475 | <.001 | Month | 124197.56 | 10271.921 | <.001 |
| Taste loss (lag: 2 weeks) | –4604.735 | 4542.435 | .317 | Taste loss (lag: 1 week) | 3264.247 | 1174.573 | .009 |
| R 2 = 0.744 | Taste loss (lag: 3 weeks) | 4430.998 | 1172.683 | .001 | |||
| R 2 = 0.843 | |||||||
| Month | 368141.424 | 34967.842 | <.001 | Month | 130744.074 | 11033.681 | <.001 |
| Smell loss (lag: 2 weeks) | –6205.882 | 4995.789 | .222 | Smell loss (lag: 2 weeks) | 6025.338 | 1289.034 | <.001 |
| R 2 = 0.736 | R 2 = 0.807 | ||||||
| Month | 286427.622 | 38786.036 | <.001 | Month | 139022.829 | 12484.744 | <.001 |
| Fever (lag: 2 weeks) | –18475.442 | 6310.324 | .006 | Fever (lag: 2 weeks) | 6359.982 | 1887.627 | .002 |
| R 2 = 0.787 | R 2 = 0.764 | ||||||
| Month | 284906.054 | 34068.422 | <.001 | Month | 140929.918 | 12454.365 | <.001 |
| Cough (lag: 2 weeks) | –18397.907 | 4754.003 | <.001 | Cough (lag: 2 weeks) | 5794.213 | 1645.429 | .001 |
| R 2 = 0.814 | R 2 = 0.769 | ||||||
| Month | 292549.787 | 35925.514 | <.001 | Month | 125283.07 | 9150.488 | <.001 |
| Headache (lag: 3 weeks) | –29846.516 | 10117.8591 | .006 | Headache (lag: 3 weeks) | 7519.16 | 2735.181 | .009 |
| R 2 = 0.773 | Headache (lag: 2 weeks) | 8828.424 | 2753.355 | .003 | |||
| R 2 = 0.868 | |||||||
| Month | 305947.217 | 31327.072 | <.001 | Month | 142714.572 | 16100.452 | <.001 |
| Dyspnea (lag: 1 week) | –15789.835 | 7301.935 | .038 | Dyspnea (lag: 2 weeks) | 3697.781 | 2514.167 | .150 |
| Dyspnea (lag: 2 weeks) | –17374.205 | 7050.279 | .01878 | R 2 = 0.707 | |||
| R 2 = 0.814 | |||||||
| Month | 305214.726 | 38859.025 | <.001 | … | … | … | … |
| Cough (lag: 2 weeks) | –52445.943 | 18270.325 | .007 | … | … | … | … |
| Fever (lag: 2 weeks) | 50882.5341 | 23382.953 | .037 | … | … | … | … |
| Headache (lag: 3 weeks) | –25093.088 | 10181.607 | .019 | … | … | … | … |
| R 2 = 0.828 | … | ||||||
SE, standard error.