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Granger causality test for World Health Organization (WHO) topics as independent variables and the topics of WHO followers as dependent variables.
| Topics | F test | P value |
| Teamwork | 0.04 | .99 |
| Charity | 0.31 | .91 |
| Surveillance | 4.74 | .01 |
| Prevention | 0.27 | .92 |
| Solidarity | 0.16 | .97 |
| Ill-effect | 1.49 | .29 |
| Credibility | 2.57 | .11 |
