Table 2. Regression coefficients calculated on log2-transformed data spanning pre- and post-pandemic periods.
| Outcome | Intercept | Estimates with standard errors (SE) | AdjustedR2 | ||||
|---|---|---|---|---|---|---|---|
| H1.99 | H3.03 | H1.07 | H3.07 | H1.09 | |||
| H7.03 | 5.99 | -0.03 | 0.05 | 0.05 | 0.16 | 0.25 | 0.28 |
| SE | 0.14 | 0.013 | 0.011 | 0.013 | 0.012 | 0.009 | |
| *** | * | *** | *** | *** | *** | ||
| H9.99 | 3.90 | -0.12 | 0.14 | 0.29 | 0.35 | 0.38 | |
| SE | 0.15 | 0.014 | 0.014 | 0.011 | 0.010 | ||
| *** | *** | *** | *** | *** | |||
| H9.07 | 4.22 | -0.05 | 0.08 | 0.11 | 0.16 | 0.32 | 0.37 |
| SE | 0.15 | 0.013 | 0.011 | 0.014 | 0.013 | 0.011 | |
| *** | *** | *** | *** | *** | *** | ||
Outcome refers to reactivity against heterologous antigens on which serological responses against recent human influenza virus antigens were regressed (explanatory variables). The number of asterisks indicates level of significance.
Significance codes: 0 ***0.001 **0.01 *0.05.1.