Table 2.
Plasmodium falciparum parasitaemia stratified by age, sex, socioeconomic status and setting, mean parasitaemia and results from bivariate negative binomial regression models on Plasmodium falciparum parasitaemia
| Variable | Total examined | Positive for P. falciparuminfection | P. falciparumparasitaemia categories (parasites/μl of blood) | Negative binomial regression model for P. falciparumparasitaemia (parasites/μl of blood) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Geometric mean parasitaemia | <50 | 50-499 | 500-4,999 | 5,000-49,999 | ≥50,000 | |||||
| n (%) | n (%) | n (%) | n (%) | n (%) | IRR (95% CI) | p-value | ||||
| Age group (years) | ||||||||||
| 5-10 | 3,486 | 2,397 | 541.8 | 1,212 (34.8) | 979 (28.1) | 1,141 (32.7) | 151 (4.3) | 3 (0.1) | 1.00 | |
| 11-16 | 1,636 | 1,142 | 421.0 | 564 (34.5) | 539 (33.0) | 475 (29.0) | 58 (3.6) | 0 (0.0) | 0.78 (0.67, 0.90) | 0.001* |
| Sex | ||||||||||
| Male | 2,714 | 1,942 | 511.3 | 875 (32.2) | 814 (30.0) | 915 (33.7) | 109 (4.0) | 1 (0.0) | 1.00 | |
| Female | 2,408 | 1,597 | 485.4 | 901 (37.4) | 704 (29.2) | 701 (29.1) | 100 (4.2) | 2 (0.1) | 1 (0.87, 1.14) | 0.950 |
| Socioeconomic status | ||||||||||
| 1 | 1,076 | 855 | 520.1 | 268 (24.9) | 357 (33.2) | 405 (37.6) | 45 (4.2) | 1 (0.1) | 1.00 | |
| 2 | 1,011 | 755 | 466.3 | 294 (29.1) | 342 (33.8) | 335 (33.1) | 40 (4.0) | 0 (0.0) | 0.90 (0.73, 1.11) | 0.314 |
| 3 | 946 | 664 | 515.2 | 312 (33.0) | 283 (29.9) | 313 (33.1) | 37 (3.9) | 1 (0.1) | 0.95 (0.77, 1.18) | 0.642 |
| 4 | 966 | 595 | 524.8 | 402 (41.6) | 244 (25.3) | 278 (28.8) | 42 (4.4) | 0 (0.0) | 0.81 (0.66, 1.01) | 0.061 |
| 5 | 1,123 | 670 | 475.4 | 500 (44.5) | 292 (26.0) | 285 (25.4) | 45 (4.0) | 1 (0.1) | 0.89 (0.72, 1.09) | 0.265 |
| Setting | ||||||||||
| Rural | 3,958 | 2,870 | 495.7 | 1,239 (31.3) | 1241 (31.4) | 1319 (33.3) | 157 (4.0) | 2 (0.1) | 1.00 | |
| Urban | 1,164 | 669 | 515.6 | 537 (46.1) | 277 (23.8) | 297 (25.5) | 52 (4.5) | 1 (0.1) | 1.02 (0.87, 1.20) | 0.800 |
*Statistically significant (p <0.05).
IRR: incidence rate ratio.
Socioeconomic status: from less wealthy (1) to wealthiest (5).