Table 3.

    Age and gender based sub-group analysis among the three groups

Groups	No. of patients (n)	CT severity score (mean ± SD)	p value
Age-based sub-group analysis
Age < 30
Non-vaccinated	131	4.6 ± 8.2	0.1811
Vaccinated	28	1.9 ± 3.7
Age 30–45
Non-vaccinated	204	8.5 ± 10.8	0.0031
Vaccinated	57	3.9 ± 6.8
Age 46–60
Non-vaccinated	151	14.1 ± 12.1	0.0341
Vaccinated	76	9.9 ± 9.9
Age > 60
Non-vaccinated	95	14.8 ± 11.6	0.3851
Vaccinated	84	13.1 ± 11.1
Gender-based sub-group analysis
Male
Non-vaccinated	373	10.7 ± 11.9	0.1541
Vaccinated	161	8.5 ± 9.8
Female
Non-vaccinated	208	9.2 ± 10.5	0.7081
Vaccinated	84	9.5 ± 10.8
Vaccinated group
Male	161	8.5 ± 9.8	0.4501
Female	84	9.5 ± 10.8
Non-vaccinated group
Male	373	10.7 ± 11.9	0.3591
Female	208	9.2 ± 10.5

¹Mann-Whitney U test

p values < 0.05 are considered significant (bold)