Table 3.
Comparison of H2 antibody-positive and negative participants.
| Seropositive participants |
Seronegative participants |
p-value | |
|---|---|---|---|
| Number of participants | 4 | 23 | - |
| Smoke or chew tobacco | 0 | 12 | 0.106 |
| Currently vaccinated for seasonal influenza ('07-'08) | 0 | 7 | 0.545 |
| Vaccinated for seasonal influenza in last 3 years | 1 | 9 | 0.758 |
| Reported influenza in last 3 years | 2 | 7 | 0.582 |
| Exposed to H2-positive pigs in 2006 | 1 | 10 | 1.0 |
| Mean age*a | 53 years | 33 years | 0 |
| Percentage of persons born prior to 1968b | 75% | 22% | 0.022 |
| Gender ratio (male:female) | 4:0 | 19:4 | 1.0 |
*
One participant did not provide an age
a
Statistically significant: t=4.74, p=0.00, 95%CI (11.8, 29.9)
b
Statistically significant: Fisher's exact test p=0.022