Table 1. Baseline characteristics of subjects with suspected Chikungunya virus infection.
| Symptoms or association of symptoms | Total N = 687 |
CHIK+ n = 467 |
CHIK− n = 220 |
||||
|---|---|---|---|---|---|---|---|
| n | % | n | % | n | % | p* | |
| Fever | 502 | 73.1 | 371 | 79.4 | 131 | 59.6 | < .0001 |
| Arthralgia | 353 | 51.4 | 292 | 62.5 | 61 | 27.7 | < .0001 |
| Arthralgia of the wrist | 87 | 12.7 | 75 | 16.1 | 12 | 5.5 | < .0001 |
| Arthralgia of the metacarpophalangeal joints | 47 | 6.8 | 40 | 8.6 | 7 | 3.2 | .009 |
| Arthralgia of the ankle | 131 | 19.1 | 110 | 23.6 | 21 | 9.6 | < .0001 |
| Arthralgia of the knee | 153 | 22.3 | 127 | 27.2 | 26 | 11.8 | < .0001 |
| Arthralgia of the shoulder | 58 | 8.4 | 49 | 10.5 | 9 | 4.1 | .005 |
| Arthralgia of the pelvis | 25 | 3.6 | 22 | 4.7 | 3 | 1.4 | .03 |
| Low back pain | 69 | 10.0 | 48 | 10.3 | 21 | 9.6 | .77 |
| Myalgia | 114 | 16.6 | 82 | 17.8 | 32 | 14.6 | .32 |
| Digestive symptoms | 151 | 22.0 | 91 | 19.5 | 60 | 27.3 | .02 |
| Neurological symptoms | 258 | 37.6 | 166 | 35.6 | 92 | 41.8 | .11 |
| Lymphopenia | 407 | 61.3 | 345 | 75.3 | 62 | 30.1 | < .0001 |
| Absence of neutrophil leukocytosis | 517 | 77.9 | 415 | 90.6 | 102 | 49.5 | < .0001 |
Missing data: neutrophils (n = 23); lymphocytes (n = 23)—CHIK+: Positive RT-PCR; CHIK-: Negative RT-PCR–
* Pearson’s Chi2 test