Table 1.
Cross-Correlation Analysis Between Weekly Number of SARS-CoV-2 tests in the USA and Italy with Google Trends Scores for Suggestive Symptoms
| USA | |||
|---|---|---|---|
| Search Term | Optimal Time Lag | Cross-Correlation Coefficient | P Value |
| Fever | –1 | –0.643 | <.001 |
| Cough | –1 | –0.632 | <.001 |
| Headache | –4 | –0.538 | <.001 |
| Smell loss | 0 | 0.345 | .027 |
| Taste loss | –1 | 0.386 | .013 |
| Dyspnea | –1 | –0.494 | .002 |
| Italy | |||
| Fever | 0 | –0.118 | .4499 |
| Cough | 0 | –0.091 | .5601 |
| Headache | –2 | 0.426 | .006 |
| Smell loss | –2 | 0.306 | .050 |
| Taste loss | –3 | 0.408 | .009 |
| Dyspnea | 0 | –0.396 | .011 |