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Sample size and self-reported vaccination and influenza rates for each surveyed season.
| Influenza season | Sample size | |
|---|---|---|
| Ego | Alter | |
| Fall 2015 to Spring 2016 | 2,173 | 2,102 |
| Fall 2016 to Spring 2017 | 1,935 | 1,852 |
| Fall 2017 to Spring 2018 | 1,888 | 1,749 |
| Fall 2018 to Spring 2019 | 1,740 | 1,695 |
| Fall 2019 to Spring 2020 | 1,642 | 1,643 |
