Table 3. Demographic and clinical characteristics of patients enrolled in sentinel surveillance for severe acute respiratory infections by viral influenza etiology, Sultanate of Oman, January 2008-June 2013.
| Samples tested for influenza (n = 5147) | |||
|---|---|---|---|
| Characteristic | Influenza Positive | Influenza Negative | P Value a |
| (N = Total Known) | (N = 423) | (N = 4724) | |
| N (% column total) | |||
| Age group (N = 5147) | |||
| <2 Years | 144 (34) | 2781 (59) | <0.01 |
| 2–4 Years | 54 (13) | 622 (13) | |
| 5–14 Years | 53 (13) | 335 (7) | |
| 15–49 Years | 91 (22) | 470 (10) | |
| 50–64 Years | 42 (10) | 242 (5) | |
| ≥65 Years | 39 (9) | 274 (6) | |
| Male Sex (N = 5138) | 201 (48) | 2296 (49) | 0.75 |
| Preexisting Chronic Conditions b (N = 5113) | 150 (35) | 1339 (28) | <0.01 |
| Antibiotic use before admission c (N = 4028) | 68 (16) | 684 (14) | 0.05 |
| Antibiotic Use During Hospitalization (N = 5117) | 304 (72) | 3477 (74) | 0.57 |
| Intensive Care Unit Admission (N = 4210) | 32 (8) | 369 (8) | 0.70 |
| Ventilated (N = 4211) | 18 (4) | 121 (3) | 0.01 |
| Died (N = 4618) | 14 (3) | 131 (3) | 0.52 |
aP-values are based on the chi-square test.
b Chronic conditions include preexisting respiratory, cardiac, renal, hepatic, hematologic, neurologic, infectious, endocrine, and gastrointestinal conditions.
c Antibiotic use in the three days prior to hospital admission.