Table 1.

Demographic characteristics of healthcare workers (n = 734).

Characteristics	N (%)	Mean Age (± SD)	Mean Titer (± SD)
Total number	734 (100)	29.88 ± 4.00	353.47 ± 390.55
Gender
Male	253 (34.5)	29.35 ± 4.01	317.49 ± 377.31
Female	481 (65.5)	30.16 ± 3.97	372.29 ± 396.38
Time from vaccination
<20 years	376 (51.2)	28.42 ± 1.85	359.05 ± 392.25
≥20 years	358 (48.8)	31.41 ± 4.97	346.23 ± 388.82
Age of vaccination
1 year old	155 (21.1)	24.68 ± 1.88	232.77 ± 341.69
12 years old	579 (78.9)	31.27 ± 3.19	375.78 ± 395.15