Table 3. Comparison of individuals with CHIKV IgG- and/or IgM-positive and negative antibodies in the Chapada district (N = 120).
| Positive (N = 24) | Negative (N = 96) | P value | |
|---|---|---|---|
| Sex, Female | 10 (41.7%) | 52 (54.2%) | 0.27 |
| Age groups (years)1 | 0.94 | ||
| 0–15 | 3 (13.0%) | 19 (19.8%) | |
| >15–30 | 7 (30.4%) | 23 (24.0%) | |
| >30–45 | 6 (26.1%) | 22 (22.9%) | |
| >45–60 | 4 (17.4%) | 16 (16.7%) | |
| >60 | 3 (13.0%) | 16 (16.7%) | |
| Race1 | 0.74 | ||
| White | 0 (0.0%) | 3 (3.1%) | |
| Mixed | 15 (65.2%) | 54 (56.3%) | |
| Black | 8 (34.8%) | 37 (38.5%) | |
| Less than 4 years of schooling | 8 (33.3%) | 45 (46.9%) | 0.23 |
| Fever in the last 2 years | 16 (66.7%) | 28 (29.2%) | <0.01 |
| Joint pain in the last 2 years | 13 (54.2%) | 17 (17.7%) | <0.01 |
| Fever and joint pain in the last 2 years | 13 (54.2%) | 13 (13.5%) | 0.01 |
| Prior clinical diagnosis in the last 2 years | |||
| Dengue | 0 (0%) | 7 (7.3%) | 0.40* |
| Zika | 2 (8.3%) | 4 (4.2%) | 0.69* |
| Chikungunya | 13 (54.2%) | 2 (2.1%) | <0.01* |
1Information available for 23 individuals
2Fisher's exact test