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. 2012 Mar;19(3):429–435. doi: 10.1128/CVI.05528-11

Table 1.

Demographic characteristics and prevaccination antibody titer

Parametera Value for:
Adults (n = 125)
Elderly (n = 93)
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
a

BMI, body mass index; T2DM, type 2 diabetes mellitus; GMT, geometric mean titer; HAI, hemagglutination inhibition.

b

Values were determined by the chi-square test except for those marked with an asterisk, which were calculated by Fisher's exact test.

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