Table 1 Demographic and clinical characteristics of military trainees according to etiology of febrile respiratory illness (2004-2009)
Variable by FRI outcome | Total study population | Adenovirus | Influenza | Other |
|---|---|---|---|---|
( n = 21,570) | ( n = 13,725) | ( n = 1,435) | ( n = 6,410) | |
Continuous variablese | valuea | valuea | valuea | valuea |
Age (years) | 20.8 (3.8) | 20.5 (3.7) | 21.2 (3.7) | 21.2 (4.2) |
Symptom duration (days) | 3.0 (1-90) | 3.0 (1-90) | 3.0 (1-52) | 3.0 (1-84) |
Temperature (°C) | 38.2 (1.5) | 38.4 (1.5) | 38.4 (1.3) | 38.2 (1.5) |
Smoking history (pack-years) | 1.0 (0-99) | 1.0 (0-99) | 1.0 (0-72) | 0.5 (0-40) |
Days since vaccinationb (Influenza) | 31.0 (0-365) | 33.0 (0-363) | 10.0 (0-351) | 29.0 (0-365) |
Training week | 4.7 (3.0) | 5.0 (2.6) | 3.2 (3.2) | 4.7 (3.8) |
Categorical variablese | n (%) | n (%) | n (%) | n (%) |
Training season | ||||
Fall | 5,088 (23.6) | 3,423 (24.9) | 227 (15.8) | 1,438 (22.4) |
Spring | 4,675 (21.7) | 3,144 (22.9) | 78 (5.4) | 1,453 (22.7) |
Summer | 6,574 (30.5) | 4,501 (32.8) | 403 (28.1) | 1,670 (26.1) |
Winter | 5,233 (24.3) | 2,657 (19.4) | 727 (50.7) | 1,849 (28.8) |
Sex | ||||
Female | 2,846 (13.2) | 1,568 (11.4) | 252 (17.6) | 1,026 (16.0) |
Male | 18,724 (86.8) | 12,157 (88.6) | 1,183 (82.4) | 5,384 (84.0) |
Acute onset | ||||
≤3 days | 12,750 (59.1) | 7,623 (55.5) | 1,060 (73.9) | 4,067 (63.4) |
>3 days | 8,820 (40.9) | 6,102 (44.5) | 375 (26.1) | 2,343 (36.6) |
Fever | ||||
≥38.0°C | 17,917 (83.0) | 11,945 (87.0) | 1,232 (85.9) | 4,740 (73.9) |
<38.0°C | 3,653 (17.0) | 1,780 (13.0) | 203 (14.1) | 1,670 (26.1) |
First visit | ||||
Yes | 14,659 (68.0) | 8,867 (64.6) | 1,065 (74.2) | 4,727 (73.7) |
No | 6,911 (32.0) | 4,858 (35.4) | 370 (25.8) | 1,683 (26.2) |
Pneumoniac | ||||
Yes | 2,882 (13.4) | 1,624 (11.8) | 107 (7.5) | 1,151 (18.0) |
No | 18,688 (86.6) | 12,101 (88.1) | 1,328 (92.5) | 5,259 (82.0) |
Sore throat | ||||
Yes | 19,174 (88.9) | 12,771 (93.0) | 1,168 (81.3) | 5,235 (81.7) |
No | 2,396 (11.1) | 954 (7.0) | 267 (18.6) | 1,175 (18.3) |
Cough | ||||
Yes | 19,249 (89.2) | 12,559 (91.5) | 1,410 (98.3) | 5,280 (82.4) |
No | 2,321 (10.7) | 1,166 (8.5) | 25 (1.7) | 1,130 (17.6) |
Shortness of breath | ||||
Yes | 8,045 (37.3) | 5,010 (36.5) | 545 (38.0) | 2,490 (38.8) |
No | 13,525 (62.7) | 8,715 (63.5) | 890 (62.0) | 3,920 (61.2) |
Nasal congestion | ||||
Yes | 17242 (80.0) | 11223 (81.8) | 1153 (80.3) | 4,866 (75.9) |
No | 4328 (20.1) | 2502 (18.2) | 282 (19.7) | 1,544 (24.1) |
Headache | ||||
Yes | 17,890 (82.9) | 1,1571 (84.3) | 1,204 (84.0) | 5,115 (79.8) |
No | 3680 (17.1) | 2154 (15.7) | 231 (16.0) | 1,295 (20.2) |
Conjunctivitis | ||||
Yes | 1,901 (8.8) | 1,224 (8.9) | 76 (5.3) | 601 (9.4) |
No | 19,669 (91.2) | 12,501 (91.1) | 1,359 (94.7) | 5,809 (90.6) |
Body aches | ||||
Yes | 15,318 (71.0) | 9,804 (71.4) | 1,073 (74.8) | 4,441 (69.3) |
No | 6,252 (29.0) | 3,921 (28.6) | 362 (25.2) | 1,969 (30.7) |
Nausea/vomiting | ||||
Yes | 10,757 (49.9) | 7,135 (51.9) | 701 (48.9) | 2,921 (45.6) |
No | 10,813 (50.1) | 6,590 (48.1) | 734 (51.1) | 3,489 (54.4) |
Asthma | ||||
Yes | 1,153 (5.3) | 670 (4.9) | 85 (5.9) | 398 (6.2) |
No | 20,417 (94.7) | 13,055 (95.1) | 1,350 (94.1) | 6,012 (93.8) |
Smoker | ||||
Yes | 6,942 (32.2) | 4,360 (31.8) | 406 (28.3) | 2,176 (33.9) |
No | 14,628 (67.8) | 9,365 (68.2) | 1,029 (71.7) | 4,234 (66.1) |
Vaccinated (influenza)d | ||||
Yes | 14,005 (65.0) | 8,685 (63.3) | 888 (61.9) | 4,432 (69.1) |
No | 7,565 (35.0) | 5,040 (36.7) | 547 (38.1) | 1,978 (30.9) |