Figure 2.

Clustered bar chart based on paired t-test of GISs before and during lockdown. In academic statistical analysis, NS typically denotes a P-value greater than 0.05, indicating a lack of statistical significance in the results. The symbol * is used to denote a P-value less than or equal to 0.05, signifying statistical significance. Similarly, ** represents a P-value less than or equal to 0.01, while ***indicates a P-value less than or equal to 0.001, highlighting varying degrees of significance in the findings.