Table 2: Mann-Whitney U comparison of antibody titers between age groups.

Age comparison

50

< 50

50 Median

< 50 Median

Median diff

95% CI

p

10 days

Total (BAU/mL)

15

46

0.45

2.94

1.12

0 to 3.69

0.02*

IgG (BAU/mL)

15

46

6.89

17.8

11.4

2.72 to 37.1

0.01*

IgM (COI)

15

46

0.11

0.47

0.24

0.05 to 0.52

0.01*

Neutralizing (ug/mL)

15

46

0.02

0.05

0.02

-0.001 to 0.07

0.06

20 days

Total (BAU/mL)

15

42

1632

2261

313

-360 to 1103

0.28

IgG (BAU/mL)

15

42

2186

2515

300

-692 to 1176

0.51

IgM (COI)

15

42

2.55

2.36

-0.26

-1.8 to 1.05

0.70

Neutralizing (ug/mL)

15

42

2.71

3.65

0.69

-0.36 to 1.90

0.20

diff: Difference; CI: Confidence Interval; COI: Cut-Off Index
*indicates a significant difference