Table 1.
Demographic characteristics and prevaccination antibody titer
Parametera | Value for: |
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---|---|---|---|---|---|---|---|
Adults (n = 125) |
Elderly (n = 93) |
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15 μg, 1 dose (n = 42) | 15 μg, 2 doses (n = 41) | 30 μg, 2 doses (n = 42) | Pb | 15 μg, 2 doses (n = 48) | 30 μg, 2 doses (n = 45) | Pb | |
No. (%) of males | 13 (31.7) | 17 (41.5) | 11 (26.8) | 0.318 | 22 (64.7) | 12 (35.3) | 0.084* |
Age (yr) ± SD | 37.0 ± 8.4 | 37.8 ± 9.6 | 38.8 ± 8.0 | 0.647 | 68.9 ± 6.2 | 68.6 ± 5.5 | 0.835 |
BMI (kg/m2) | 24.0 ± 3.6 | 24.2 ± 4.2 | 23.8 ± 4.6 | 0.877 | 24.7 ± 3.0 | 25.7 ± 5.1 | 0.254 |
No. (%) with T2DM | 0 | 1 (2.4) | 2 (4.8) | 0.362 | 9 (18.8) | 10 (22.2) | 0.798* |
No. (%) with HAI titer ≥1:40 | 2 (4.8) | 0 | 3 (7.1) | 0.240 | 2 (4.2) | 2 (4.4) | 1.000* |
No. (%) with HAI titer ≥1:10 (%) | 9 (21.4) | 4 (9.8) | 8 (19.0) | 0.325 | 18 (37.5) | 13 (28.9) | 0.379 |
GMT (95% CI) | 6.7 (5.5–8.2) | 5.4 (5.0–5.9) | 7.2 (5.4–9.7) | 0.149 | 7.4 (6.2–8.8) | 6.8 (5.7–8.1) | 0.496 |
BMI, body mass index; T2DM, type 2 diabetes mellitus; GMT, geometric mean titer; HAI, hemagglutination inhibition.
Values were determined by the chi-square test except for those marked with an asterisk, which were calculated by Fisher's exact test.