Table 6.
Summary of risk ratio (RR) for main outcomes from collected studies by age groups of participants (note: 95% CI = 95% confidence interval; ARI = acute respiratory illness; LRTD = lower respiratory tract disease).
| Outcome | Studies | Subjects Aged ≥70/75 Years (/Total, %) |
Subjects Aged <70/75 Years (/Total, %) |
RR (95% CI) | Heterogeneity | ||
|---|---|---|---|---|---|---|---|
| I2 (95% CI) | τ2 (95% CI) | Q (p-Value) | |||||
| First Season | |||||||
| ARI | [51,52,82] | 18/13,627 (0.13%) | 43/23,951 (0.18%) | 0.800 (0.459; 1.392) |
0.0% (0.0; 89.6) |
0.000 (0.000; 6.721) |
1.40 (0.496) |
| LRTD (2 symptoms) |
[51,52,82] | 6/13,627 (0.04%) | 24/23,951 (0.10%) | 0.522 (0.211; 1.291) |
0.0% (0.0; 89.6) |
0.000 (0.000; 14.509) |
0.84 (0.657) |
| LRTD (3+ symptoms) |
[51,52,81,82] | 5/19,130 (0.03%) | 13/30,914 (0.04%) | 0.819 (0.304; 2.207) |
0.0% (0.0; 84.7) |
0.000 (0.000; 7.504) |
1.30 (0.729) |