Table 4. Comparison of median number of GP visits within 1 year before pertussis diagnosis by history of influenza vaccination and age groups in persons ≥50 years of age, Australia*.
| Age group, y | History of influenza vaccination, median (IQR) visits |
p value† | |
|---|---|---|---|
| No | Yes | ||
| 50–64 | 5 (8) | 9 (8) | <0.001 |
| 65–74 | 6 (9.5) | 13 (9) | <0.001 |
| 75–84 | 8 (12) | 13 (15) | <0.001 |
| ≥85 | 8 (10.5) | 15 (17) | 0.01 |
*GP, general practitioner; IQR, interquartile range. †Differences in median number of GP visits within 1 year before the pertussis diagnosis within each age group.