Table 2. Outcomes of SARI patients with and without laboratory-confirmed influenza. Beijing, China, week 40, 2014–week 39, 2016*.
| Characteristic | All SARI patients, n = 2,212 | SARI patients without confirmed influenza, n = 1,759 | SARI patients with confirmed influenza, n = 453 | p value† |
|---|---|---|---|---|
| Sex | ||||
| M | 1,298 (58.7) | 1,030 (58.6) | 268 (59.2) | 0.816 |
| F |
914 (41.3) |
729 (41.4) |
185 (40.8) |
|
| Age group, y | ||||
| 0–4 | 973 (44.0) | 778 (44.2) | 195 (43.1) | <0.001 |
| 5–14 | 368 (16.6) | 260 (14.8) | 108 (23.8) | |
| 15–24 | 40 (1.8) | 35 (2.0) | 5 (1.1) | |
| 25–59 | 284 (12.8) | 235 (13.4) | 49 (10.8) | |
|
>60 |
547 (24.7) |
451 (25.6) |
96 (21.2) |
|
| Underlying medical condition | ||||
| >1‡ | 548 (24.8) | 450 (25.6) | 98 (21.6) | 0.083 |
| Pulmonary diseases§ | 224 (10.1) | 175 (10.0) | 49 (10.8) | 0.585 |
| Cardiovascular diseases | 380 (17.2) | 321 (18.3) | 59 (13.0) | 0.009 |
| Metabolic diseases¶ | 71 (3.2) | 61 (3.5) | 10 (2.2) | 0.175 |
| Renal dysfunction | 22 (1.0) | 19 (1.1) | 3 (0.7) | 0.424 |
| Hepatic dysfunction | 10 (0.5) | 10 (0.6) | 0 (0.0) | 0.108 |
| Tumor | 31 (1.4) | 27 (1.5) | 4 (0.9) | 0.292 |
| Immune system diseases |
1 (0.1) |
1 (0.1) |
0 (0.0) |
0.612 |
| Received influenza vaccine within 1 y |
121 (5.5) |
90 (5.1) |
31 (6.8) |
0.15 |
| Treatment | ||||
| Antiviral drugs | 30 (1.4) | 14 (0.8) | 16 (3.5) | <0.001 |
| Antibacterial drugs | 2,171 (98.2) | 1,722 (97.9) | 449 (99.1) | 0.086 |
| Corticosteroids | 214 (9.7) | 154 (8.8) | 60 (13.3) | 0.004 |
| Oxygen therapy | 589 (26.6) | 492 (28.0) | 97 (21.4) | 0.005 |
| Mechanical ventilation |
12 (0.5) |
8 (0.5) |
4 (0.9) |
0.428 |
| Complication | 510 (23.1) | 415 (23.6) | 95 (21.0) | 0.237 |
| Pneumonia |
389 (17.6) |
321 (18.3) |
68 (15.0) |
0.106 |
| Median length of hospital stay, d (IQR) |
8.8 (8.6–9.0) |
9.0 (8.7–9.3) |
8.0 (7.5–8.4) |
<0.001 |
| Admission to ICU |
28 (1.3) |
20 (1.1) |
8 (1.8) |
0.286 |
| Died | 9 (0.4) | 8 (0.5) | 1 (0.2) | 0.485 |
*Values are no. (%) unless otherwise indicated. The weeks range from 2014 Sep 29 through 2016 Oct 2. ICU, intensive care unit; IQR, interquartile range; SARI, severe acute respiratory infection. †Calculated by χ2 test. ‡Defined as any inpatient stays with admission diagnosis in any of the following diseases, symptoms, or signs: pulmonary disease, cardiovascular disease, chronic metabolic disease, renal dysfunction, hepatic diseases, or tumor. §Asthma, chronic obstructive pulmonary disease, emphysema, chronic bronchitis. ¶Diabetes, dyslipidemia.