Table 1. Characteristics of Patients With Acute Respiratory Infections in the 2013-2014 and 2014-2015 Influenza Seasons at Ambulatory Care Settings Affiliated With the US Influenza Vaccine Effectiveness Networka.
| Characteristic | Patients, No. (%) | |
|---|---|---|
| Total (N = 14 987)b | Prescribed Antibiotic (n = 6136)c | |
| Sex | ||
| Male | 6349 (42) | 2567 (40) |
| Female | 8638 (58) | 3569 (41) |
| Age group, y | ||
| 0.5-2 | 918 (6) | 398 (43) |
| 2 to <5 | 1488 (10) | 589 (40) |
| 5 to <18 | 3294 (22) | 1186 (36) |
| 18 to <50 | 4948 (33) | 1938 (39) |
| 50 to <65 | 2563 (17) | 1183 (46) |
| ≥65 | 1776 (12) | 842 (47) |
| Race | ||
| White | 11 892 (80) | 5150 (43) |
| Black | 1407 (9) | 424 (30) |
| Other | 1619 (11) | 534 (33) |
| Study site | ||
| A | 4286 (29) | 1353 (32) |
| B | 3112 (21) | 1629 (52) |
| C | 2699 (18) | 1166 (43) |
| D | 2315 (15) | 858 (37) |
| E | 2575 (17) | 1130 (44) |
| Time from symptom onset to presentation for care, d | ||
| ≤2 | 4678 (31) | 1610 (34) |
| 3-4 | 5719 (38) | 2406 (42) |
| 5-7 | 4590 (31) | 2120 (46) |
| ≥1 Chronic medical condition | 5331 (36) | 2315 (43) |
| Laboratory-confirmed influenzad | 3381 (22) | 1017 (30) |
a
Acute respiratory infection is defined by cough with 7 days’ duration or less.
b
Percentage indicates the percentage in the column.
c
Percentage indicates the percentage in the row.
d
Tested by real-time reverse transcriptase–polymerase chain reaction in all enrolled patients. Testing was performed for research purposes. Clinicians were unaware of results, except for 1 site at which clinicians were notified of positive real-time reverse transcriptase–polymerase chain reaction research results within 48 hours of enrollment.