All admissions | Influenza-positive | Crude OR | Heterogeneity by strain (I2)a | aORb | ||||
---|---|---|---|---|---|---|---|---|
N = 9164 | N = 2177 | |||||||
Characteristic | n | n | % | Value | 95 % CI | Value | 95 % CI | |
Age | ||||||||
0–1 y | 1515 | 144 | 9.5 | 1.00 | - | 32.5 % | 1.00 | - |
2–4 y | 2206 | 429 | 19.4 | 2.30 | 1.88-2.81 | 0.0 % | 2.14 | 1.74-2.64 |
5–17 y | 827 | 280 | 33.9 | 4.87 | 3.90-6.10 | 73.3 % | 4.34 | 3.42-5.51 |
18–49 y | 1461 | 423 | 29.0 | 3.88 | 3.16-4.77 | 59.2 % | 3.11 | 2.49-3.90 |
50–64 y | 748 | 191 | 25.5 | 3.26 | 2.57-4.14 | 72.5 % | 4.08 | 3.11-5.36 |
65–74 y | 819 | 211 | 25.8 | 3.30 | 2.62-4.17 | 67.8 % | 4.99 | 3.76-6.64 |
75–84 y | 1227 | 294 | 24.0 | 3.00 | 2.42-3.72 | 62.4 % | 4.51 | 3.43-5.92 |
≥85 | 811 | 205 | 25.3 | 3.22 | 2.55-4.07 | 71.2 % | 4.79 | 3.59-6.40 |
Sexc | ||||||||
Male | 5417 | 1141 | 21.1 | 1.00 | - | 0.0 % | 1.00 | - |
Female | 4197 | 1036 | 24.7 | 1.24 | 1.13-1.37 | 0.0 % | 1.21 | 1.09-1.34 |
Female non-pregnant | 3899 | 876 | 22.5 | 1.11 | 1.00-1.22 | 0.0 % | 1.10 | 0.99-1.23 |
Other risk factors (excludes pregnant women) | ||||||||
Comorbidityd | 3709 | 856 | 23.1 | 1.15 | 1.04-1.27 | 62.8 % | 1.48 | 1.30-1.69 |
Cardiovascular disease | 1996 | 468 | 23.4 | 1.17 | 1.04-1.33 | 22.2 % | 1.47 | 1.25-1.72 |
Chronic obstructive pulmonary disease | 1458 | 306 | 21.0 | 1.02 | 0.88-1.17 | 57.6 % | 1.39 | 1.15-1.68 |
Asthma | 440 | 96 | 21.8 | 1.07 | 0.84-1.35 | 0.0 % | 1.37 | 1.04-1.80 |
Immunosuppression | 106 | 14 | 13.2 | 0.58 | 0.33-1.03 | 0.0 % | 0.76 | 0.40-1.46 |
Diabetes | 1048 | 234 | 22.3 | 1.10 | 0.94-1.29 | 0.0 % | 1.36 | 1.10-1.70 |
Renal disease | 588 | 129 | 21.9 | 1.08 | 0.88-1.32 | 48.2 % | 1.23 | 0.95-1.59 |
Neuromuscular | 167 | 52 | 31.1 | 0.93 | 0.68-1.26 | 38.9 % | 1.13 | 0.80-1.58 |
Neoplasm (active) | 301 | 63 | 20.9 | 1.01 | 0.76-1.35 | 55.6 % | 1.29 | 0.92-1.81 |
Liver disease | 200 | 33 | 16.5 | 0.76 | 0.52-1.11 | 50.8 % | 0.79 | 0.52-1.21 |
Autoimmune disease | 161 | 39 | 24.2 | 1.22 | 0.85-1.77 | 0.0 % | 1.44 | 0.95-2.18 |
Obesee | 1620 | 337 | 20.8 | 1.0 | 0.9-1.2 | 0.0 % | 0.87 | 0.73-1.03 |
Pregnancyf | 298 | 160 | 53.7 | 3.45 | 2.23-5.34 | 0.0 % | 2.08 | 1.43-3.03 |
Associated comorbidity | 38 | 26 | 68.4 | 7.07 | 3.09-16.18 | 0.0 % | 4.29 | 2.65-6.94 |
No comorbidity | 260 | 126 | 48.5 | 3.05 | 2.08-4.47 | 0.0 % | 1.80 | 1.22-2.66 |