Table 8.
Percentage of confirmed influenza in ILI and LRTI by age groups
| Age groups | Number of studies | N | Influenza Percentage % (95% CI) | Number of studies | N | Percentage Type A % (95% CI) | Percentage Type B % (95% CI) | |
|---|---|---|---|---|---|---|---|---|
| Confirmed influenza in ILI | 0–5 years | 5 | 1513 | 24·53 (16·94–33·01) | 5 | 390 | 94·29 (83·05–99·66) | 5·71 (0·34–16·95) |
| 5–14 years | 4 | 1193 | 29·98 (23·19–37·25) | 4 | 382 | 83·36 (45·88–99·98) | 16·64 (0·02–54·12) | |
| 14–59 years | 4 | 1891 | 19·21 (15·59–23·12) | 4 | 352 | 84·01 (60·02–98·10) | 15·99 (1·90–39·98) | |
| 60 or more | 3 | 149 | 18·55 (12·79–25·10) | 3 | 27 | 83·89 (50·73–99·77) | 16·11 (0·23–49·27) | |
| Any age* | 7 | 12 584 | 16·32 (10·41–23·26) | 7 | 1898 | 85·62 (73·84–94·30) | 14·38 (5·70–26·16) | |
| NR | 3 | 975 | 41·57 (5·09–85·05) | 3 | 262 | 80·86 (65·07–92·72) | 19·14 (7·28–34·93) | |
| Confirmed influenza in LRTI | 0–2 years | 18 | 6716 | 4·48 (3·07–6·14) | 7 | 223 | 83·53 (69·70–93·74) | 16·46 (6·26–30·30) |
| 0–5 years | 16 | 142 149 | 3·00 (2·20–3·91) | 15 | 4078 | 87·12 (79·31–93·29) | 12·88 (6·71–20·69) | |
| 5 to 14/16 years | 10 | 6856 | 11·35 (5·06–19·73) | 9 | 796 | 76·16 (57·11–90·92) | 23·84 (9·08–42·89) | |
| 14/16 to ≥59 years | 5 | 2303 | 19·38 (16·47–22·47) | 5 | 435 | 79·20 (55·22–95·48) | 20·80 (4·52–44·78) | |
| ≥60 years | 4 | 457 | 6·66 (4·57–9·11) | 4 | 29 | 92·25 (80·87–98·76) | 7·75 (1·24–19·13) | |
| All ages* | 18 | 217 784 | 2·98 (2·91–3·06) | 18 | 7111 | 79·22 (70·25–86·94) | 20·78 (13·06–29·75) | |
| NR | 3 | 1271 | 11·79 (2·04–28·01) | – | – | – | – |
*Studies without a specific age range.
ILI, influenza‐like illnesses.