Table 5. Severity of illness by vaccination status.

Age groups	Vaccination history	Mild cases (asymptomatic+mild)			Pneumonia (moderate+severe)		OR	95% CI
		n	%		n	%
Abbreviations: OR=odds ratio; CI=confidential interval.
18–59 years old	Unvaccinated	13	30.95		40	55.56	Ref	Ref
	Partially	6	14.29		10	13.89	0.54	0.16 to 1.78
	Completely primary	23	54.76		22	30.56	0.31	0.13 to 0.73
	Sub-total	42	100		72	100
≥60 years old	Unvaccinated	3	50.00		21	84.00	Ref	Ref
	Partially	1	16.67		1	4.00	0.16	0.002 to 14.92
	Completely primary	2	33.33		3	12.00	0.23	0.017 to 3.81
	Sub-total	6	100		25	100
Total	Unvaccinated	16	33.33		61	62.89	Ref	Ref
	Partially	7	14.58		11	11.34	0.41	0.14 to 1.23
	Completely primary	25	52.08		25	25.77	0.26	0.12 to 0.57
	Sub-total	48	100		97	100