Volume 14, Number 7—July 2008
Research
Determinants of Cluster Size in Large, Population-Based Molecular Epidemiology Study of Tuberculosis, Northern Malawi
Judith R. Glynn*
, Amelia C. Crampin*†, Hamidou Traore*, Steve Chaguluka†, Donex T. Mwafulirwa†, Saad Alghamdi*, Bagrey M.M. Ngwira†, Malcolm D. Yates‡, Francis D. Drobniewski‡, and Paul E.M. Fine*
, Amelia C. Crampin*†, Hamidou Traore*, Steve Chaguluka†, Donex T. Mwafulirwa†, Saad Alghamdi*, Bagrey M.M. Ngwira†, Malcolm D. Yates‡, Francis D. Drobniewski‡, and Paul E.M. Fine*
Table 2
Multivariate analysis of risk factors for larger cluster size, Malawi
| Risk factor | Cluster size* |
p value | |
|---|---|---|---|
| Odds ratio | 95% CI | ||
| Age, y | |||
| <25 | 1 | 0.01† | |
| 25–34 | 1.0 | 0.66–1.5 | |
| 35–44 | 0.76 | 0.48–1.2 | |
| >45 |
0.62 |
0.39–1.0 |
|
| Male |
1.4 |
1.0–1.8 |
0.03 |
| Area | <0.001 | ||
| South, near Chilumba | 0.54 | 0.33–0.90 | |
| Middle, near Nyungwe | 1.3 | 0.81–2.0 | |
| Around Karonga | 0.74 | 0.50–1.1 | |
| Karonga central (urban) | 1 | ||
| Kaporo area | 0.48 | 0.30–0.76 | |
| Far north | 0.55 | 0.32–0.92 | |
| Outside district | 0.41 | 0.15–1.1 | |
*Odds ratios are adjusted for the other factors shown in the table (i.e., the multivariate equation contained age group, sex, and area). CI, confidence interval.
†Trend.
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