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. 2022 Jun 13;17(6):e0269885. doi: 10.1371/journal.pone.0269885

Table 1. Characteristics of the 702 participants.

Variable All participants (n = 702) No prior infection Prior infection
Unvaccinated Vaccinated Unvaccinated Vaccinated p-value1
(n = 212) (n = 342) (109) (n = 39)
Age, median (IQR) 43 (33–59) 38 (30–51) 49 (36–63) 40 (31–55) 45 (33–58) <0.0001
Age Range
    18–45, n (%) 385 (54.8) 140 (66.0) 158 (46.2) 66 (60.6) 21 (53.8) <0.0001
    46–65, n (%) 222 (31.7) 58 (27.4) 114 (33.3) 35 (32.1) 15 (38.5)
    >66, n (%) 95 (13.5) 14 (6.6) 70 (20.5) 8 (7.3) 3 (7.7)
Gender
    Male, n (%) 332 (47.3) 102 (48.1) 160 (46.8) 48 (44.0) 22 (56.4) >0.05
    Female, n (%) 370 (52.7) 110 (51.9) 182 (53.2) 61 (56.0) 17 (43.6)

Data are presented as median (IQR) or n (%)

1 Difference among all types. Differences in measurement data among the four groups were compared with the Kruskal Wallis test followed by Dunn’s multiple comparisons test or Chi-squared test