Table 3.
Proportion of influenza B infections, according to viral lineage (pooled data from Liguria and Sicily). Period 2010-2016.
| Victoria-lineage | Yamagata-lineage | |
|---|---|---|
| Influenza B infections [n (%), % by row], n = 498 | 298 (59.8) | 200 (40.2) |
| Age (years) [median (IQR)] | 8.0 (9.0)* | 12.0 (40.0)* |
| Age groups (years) [n (%), % by column] | ||
| ≤4 | 57 (19.1) | 32 (16.0) |
| 5–9 | 124 (41.6) | 54 (27.0) |
| 10–14 | 44 (14.8) | 20 (10.0) |
| 15–19 | 13 (4.3) | 10 (5.0) |
| 20–34 | 20 (6.7) | 11 (5.5) |
| 35–49 | 10 (3.4) | 27 (13.5) |
| 50–64 | 10 (3.4) | 25 (12.5) |
| 65–85 | 20 (6.7) | 15 (7.5) |
| >85 | 0 | 6 (3.0) |
| Influenza season [n (%), % by row] | ||
| 2010-2011 | 27 (77.1) | 8 (22.9) |
| 2011-2012 | 0 | 0 |
| 2012-2013 | 5 (3.9) | 122 (96.1) |
| 2013-2014 | 0 | 1 (100.0) |
| 2014-2015 | 0 | 62 (100.0) |
| 2015-2016 | 266 (97.4) | 7 (2.6) |
| Healthcare settings [n (%), % by row]** | ||
| Community-based | 269 (63.9) | 152 (36.1) |
| Hospital-based | 29 (37.7) | 48 (62.3) |
*
p < 0.001
**
OR=2.95 (95%CI: 1.78 - 4.67). Hospital-based setting as reference group.