Comparison of Chest Computed Tomography (CT) Imaging Patterns and Severity among COVID-19 Patients during the First and Fourth Waves in Addis Ababa, Ethiopia

Table 6

Independent sample t-test to compare mean CT severity scores between 1^st and 4^th waves of COVID-19.

Variable	1^st wave	4^th wave	t-test for equality of means
			T	df	value	95% CI for mean difference
Mean CT score (SD)	13.18 (6.29)	8.31 (7.53)	5.06	198	<0.001	(3.015, 6.865)

 < 0.05.