Table 4 Hazard ratio of a Plasmodium vivax infection following a previous malaria episode within 90 days of follow-up
Rate P. vivax episode/100-person-months | Crude HR (95 % CI) | P value | Adjusted HR (95 % CI) | P value | |
|---|---|---|---|---|---|
Initial infection | |||||
P. falciparum | 5.3 (3.2–8.7) | 1 | 1 | ||
P. vivax | 11.4 (9.8–12.2) | 2.1 (1.2–3.7) | 0.009 | 2.3 (1.3–4.0) | 0.006 |
Mixed Infection | 14.2 (9.4–21.6) | 2.7 (1.4–5.1) | 0.003 | 2.9 (1.5–5.7) | 0.002 |
Gender | |||||
Female | 10.5 (8.5–13.0) | 1 | 1 | 0.983 | |
Male | 10.8 (9.0–12.9) | 1.0 (0.8–1.3) | 0.870 | 1.0 (0.8–1.3) | |
Age (years) | |||||
0–10 | 10.0 (7.7–13.0) | 1 | 1 | ||
10–20 | 10.1 (7.5–13.7) | 1.0 (0.7–1.6) | 0.865 | 1.1 (0.7–1.5) | 0.809 |
20–40 | 11.1 (8.5–14.5) | 1.1 (0.8–1.6) | 0.557 | 1.2 (0.8–1.8) | 0.284 |
40–60 | 12.3 (9.0–16.9) | 1.2 (0.8–1.8) | 0.268 | 1.3 (0.9–2.0) | 0.126 |
≥60 | 9.6 (5.4–16.8) | 0.9 (0.5–1.7) | 0.885 | 1.0 (0.5–1.7) | 0.933 |
Residence area | |||||
Road ranches | 8.7 (6.5–11.7) | 1 | 1 | 0.091 | |
Rural settlement | 11.4 (9.8–13.3) | 1.3 (0.9–1.8) | 0.108 | 1.3 (1.0–1.9) | |
Season | |||||
Rainy | 5.9 (4.4–8.0) | 1 | 1 | <0.001 | |
Dry | 13.6 (11.7–15.9) | 2.4 (1.7–3.3) | <0.001 | 2.5 (1.8–3.5) | |
Use of ITN | |||||
No | 11.0 (9.2–13.2) | 1 | 1 | 0.284 | |
Yes | 10.3 (8.3–12.7) | 0.9 (0.7–1.2) | 0.564 | 0.9 (0.7–1.1) | |