Table 4. Antigen and Mf positives in randomly versus purposively selected PSUs by age group.
| Randomly selected PSUs | Purposively selected PSUs | |||||
|---|---|---|---|---|---|---|
| Age group* | 5–9 years | ≥10 years | All ages ≥5 years | 5–9 years | ≥10 years | All ages ≥5 years |
| Valid FTS results | 1668 | 1665 | 3333 | 255 | 264 | 519 |
| Ag-positive, n (%) | 24 (1.4%) | 67 (4.0%) | 91 | 4 (1.6%) | 27 (10.2%) | 31 |
| Adjusted Ag prevalence (%, 95% CI) | 1.3% (0.8–2.1%) | 4.7% (3.1–7.0%) | 4.0% (2.8–5.6%) | 2.1% (1.0–4.3%) | 11.4% (7.9–16.1%) | 10.0% (7.4–13.4%) |
| Mf slides# available | 24 | 66 | 90 | 4 | 27 | 31 |
| Mf positive, n (% of slides) | 1 (4.2%) | 12 (18.2%) | 13 | 0 (0%) | 5 (18.5%) | 5 |
| Mf prevalence % of valid FTS (N or 95% CI)* | 0.1% (1668) | 0.7% (1664)^ | 0.6% (0.3–1.0%) | 0.0% (255) | 1.9% (264) | 1.7% (0.7–4.1%) |
* All results adjusted for sampling design; results for age 5–9 years and ≥10 years standardized for gender; results for all ages ≥5 years standardized for both age and gender.
# Mf slides were only prepared for positive FTS samples.
^ Denominator for overall prevalence is the sum of those who were FTS negative (assumed Mf negative, no slide done) and those who were FTS positive with slide available. Thus, the one FTS positive person with no slide available was excluded from analyses.