| Variable | Mean (95% CI) | Standard error | p-value |
| Prevalence in season 1 | 15 (0.12 - 0.20) | 1.6 |
|
| Prevalence in season 2 | 13 (0.10 - 0.16) | 1.4 |
|
| Difference | 0.018 (−0.02 - 0.06) | 0.021 |
|
| Ho: difference = 0 |
| 0.021 | 0.39 |
| Ha: Ha: diff < 0 |
|
| 0.80 |
| Ha: diff > 0 |
|
| 0.19 |