Skip directly to search Skip directly to A to Z list Skip directly to site content
CDC Home

Volume 14, Number 7—July 2008


Determinants of Cluster Size in Large, Population-Based Molecular Epidemiology Study of Tuberculosis, Northern Malawi

Judith R. Glynn*Comments to Author , 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*
Author affiliations: *London School of Hygiene and Tropical Medicine, London, UK; †Karonga Prevention Study, Chilumba, Malawi; ‡Health Protection Agency, London;

Main Article

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

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.

Main Article

Top of Page The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Rd. Atlanta, GA 30333, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348 - Contact CDC–INFO