Table 4. Multivariable predictors of Pv- and Pf-molFOB per follow-up interval.
Variable | P. vivax | P. falciparum | |||||||
---|---|---|---|---|---|---|---|---|---|
PQ arm | Placebo arm | Combined arms | |||||||
IRR* | CI95 | p-value | IRR* | CI95 | p-value | IRR* | CI95 | p-value | |
PQ treatment | n.a.† | n.a. | n.a. | n.a. | n.a. | n.a. | 0.89 | 0.65–1.22 | 0.474 |
New P. falc. infections in interval‡ | 1.32 | 0.92–1.89 | 0.134 | 1.10 | 0.85–1.42 | 0.466 | n.a. | n.a. | n.a. |
New P. vivax infections in interval‡ | n.a. | n.a. | n.a. | n.a. | n.a. | n.a. | 1.15 | 0.97–1.36 | 0.100 |
Age | 0.86 | 0.74–1.01 | 0.059 | 0.95 | 0.87–1.04 | 0.305 | 1.03 | 0.92–1.14 | 0.640 |
LLIN use at enrolment | 0.96 | 0.51–1.79 | 0.897 | 0.62 | 0.43–0.91 | 0.013 | 1.07 | 0.7–1.62 | 0.755 |
Hb at enrolment (g/dl) | 0.85 | 0.72–1.01 | 0.063 | 0.91 | 0.85–0.99 | 0.025 | 0.85 | 0.75–0.97 | 0.013 |
Village | |||||||||
Albinama (ref) | 1 | 1 | 1 | ||||||
Amahup | 0.02 | 0–0.11 | <0.001 | 0.56 | 0.34–0.91 | 0.020 | 0.52 | 0.25–1.07 | 0.074 |
Balif | 0.85 | 0.4–1.8 | 0.664 | 1.74 | 1.16–2.61 | 0.007 | 1.81 | 0.98–3.35 | 0.059 |
Balanga | 0.28 | 0.1–0.82 | 0.020 | 1.13 | 0.73–1.73 | 0.590 | 0.75 | 0.37–1.52 | 0.423 |
Bolumita | 1.52 | 0.73–3.17 | 0.268 | 2.67 | 1.83–3.9 | <0.001 | 6.05 | 3.32–11.05 | <0.001 |
Numangu | 0.5 | 0.15–1.68 | 0.264 | 0.76 | 0.4–1.43 | 0.394 | 2.8 | 1.39–5.64 | 0.004 |
Study Day | |||||||||
Day 0–35 (ref) | 1 | 1 | 1 | ||||||
Day 36–80 | 1.37 | 0.54–3.48 | 0.509 | 1.99 | 1.39–2.84 | <0.001 | 2.42 | 1.44–4.07 | 0.001 |
Day 81–175 | 1.34 | 0.57–3.12 | 0.503 | 0.89 | 0.61–1.3 | 0.538 | 1.13 | 0.7–1.84 | 0.616 |
Day > 175 | 0.65 | 0.25–1.69 | 0.374 | 0.56 | 0.38–0.83 | 0.004 | 0.87 | 0.48–1.56 | 0.643 |
*IRRs were modeled per sampling interval using negative binomial generalized estimating equations allowing for repeated visits with log-link and an exchangeable correlation structure.
† n.a., not applicable.
‡molFOB in the follow-up interval (time-varying covariate).
PQ: Primaquine; LLIN: long-lasting insecticide-treated net; Hb: haemoglobin.