Table 2.

Multistage intergroup and subgroup analysis among the three groups

Groups	No of patients (n)	CT severity score (mean ± SD)	p value
Non-vaccinated versus vaccinated patients
Non-vaccinated	581	10.1 ± 11.5	0.3531
Vaccinated	245	8.8 ± 10.1
Intergroup analysis: non-vaccinated versus partially vaccinated versus completely vaccinated patients
Group A—non-vaccinated	581	10.1 ± 11.4	< 0.0012 0.99 (A versus B) 0.001 (B versus C)  < 0.001 (A versus C)
Group B—incomplete (1 dose) vaccination	196	10.1 ± 10.5
Group C—complete (2 doses) vaccination	49	3.5 ± 6.3
Subgroup analysis: group C
Within 2 weeks	14	6.8 ± 9.6	0.1961
More than 2 weeks	35	2.1 ± 4.4
Subgroup analysis: vaccine sub-types (groups B and C)
Non-replicating viral vector vaccine	209	7.7 ± 9.4	0.0121
Inactivated virus vaccine	36	14.5 ± 12.6
Subgroup analysis: vaccine sub-types (group C only)
Non-replicating viral vector vaccine	42	2.4 ± 4.3	0.0471
Inactivated virus vaccine	7	7.7 ± 11.7

¹Mann-Whitney U test

²Kruskal-Wallis test

p values < 0.05 are considered significant (bold)