Volume 13, Number 8—August 2007
Research
High Prevalence of Tuberculosis in Previously Treated Patients, Cape Town, South Africa
Saskia den Boon*†‡
, Schalk W.P. van Lill*, Martien W. Borgdorff†‡, Donald A. Enarson§, Suzanne Verver†‡, Eric D. Bateman¶, Elvis Irusen*, Carl J. Lombard#, Neil W. White¶, Christine de Villiers**, and Nulda Beyers*
, Schalk W.P. van Lill*, Martien W. Borgdorff†‡, Donald A. Enarson§, Suzanne Verver†‡, Eric D. Bateman¶, Elvis Irusen*, Carl J. Lombard#, Neil W. White¶, Christine de Villiers**, and Nulda Beyers*Table 1
Prevalence estimates of tuberculosis (TB) in adults ≥15 years of age, Cape Town, South Africa*
| Characteristic | No. positive/ no. tested | Crude prevalence estimate | Prevalence estimate corrected for simple random sampling at household level | Weighted prevalence estimate, corrected for sampling and nonresponse |
|---|---|---|---|---|
| History of TB (questionnaire) | 338/3,483 | 9.7% (8.7%–10.7%) | 9.7% (8.6%–10.8%) | 9.8% (8.7%–10.9%) |
| TB abnormalities on chest radiograph | 337/2,608 | 12.9% (11.6%–14.2%) | 12.9% (11.6%–14.3%) | 12.9% (11.5%–14.3%) |
| Total smear-confirmed TB | 18/2,608 | 6.9 (3.7–10.1) | 6.9 (3.3–10.5) | 7.1 (3.3–10.8) |
| New smear-confirmed TB | 8/2,608 | 3.1 (0.9–5.2) | 3.1 (0.9–5.2) | 3.0 (0.9–5.1) |
| Total bacteriologically confirmed TB | 26/2,608 | 10.0 (6.2–13.8) | 10.0 (5.7–14.3) | 10.2 (5.8–14.6) |
| New bacteriologically confirmed TB | 16/2,608 | 6.1 (3.1–9.1) | 6.1 (3.0–9.3) | 6.2 (3.0–9.3) |
*Prevalence estimates are per 1,000 unless otherwise stated (percentage values). Values in parentheses are 95% confidence intervals.
