TABLE 3. Comparison of case fatality rate between the second and fourth waves of COVID-19, Cali.

Waves	Chi squared	DF	P value	Relative frequency	Case fatality rate
Wave 2	94 991	1	2.2e–16	0.02	2.5%
Wave 4				0.008	0.8%

DF: degrees of freedom.

Source: Prepared by the authors based on the study data.