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Volume 13, Number 11—November 2007

Research

Risk Factors for Mycobacterium ulcerans Infection, Southeastern Australia

Tricia Y.J. Quek*, Eugene Athan*†, Margaret J. Henry*, Julie A. Pasco*†Comments to Author , Jane Redden-Hoare‡, Andrew Hughes*†, and Paul D.R. Johnson*§
Author affiliations: *University of Melbourne, Melbourne, Victoria, Australia; †Barwon Health, Geelong, Victoria, Australia; ‡Barwon Health Centre of Education & Practice Development, Geelong, Victoria, Australia; §Austin Health, Melbourne, Victoria, Australia;

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Table 3

Insect exposure as risk factors for Buruli ulcer on the Bellarine Peninsula, southeastern Australia

Variable Case-patients, n (%) Control-participants, n (%) OR (95% CI)* p value
Season when frequently bitten by mosquitoes
Summer 24 (49) 373 (62) 0.71 (0.39–1.30) 0.27
Autumn 16 (33) 238 (39) 0.94 (0.49–1.79) 0.85
Winter 7 (15) 37 (6) 0.07†
Spring
12 (25)
189 (31)
0.88 (0.44–1.75)
0.71
Area most often bitten by mosquitoes
Head 18 (37) 290 (48) 0.61 (0.33–1.12) 0.11
Upper arms 30 (61) 353 (58) 1.37 (0.74–2.55) 0.31
Forearms 39 (80) 422 (69) 2.56 (1.23–5.33) 0.01
Hands 28 (57) 381 (63) 1.36 (0.71–2.62) 0.36
Torso 5 (10) 128 (21) 0.48 (0.18–1.23) 0.13
Upper legs 8 (16) 80 (13) 1.67 (0.73–3.82) 0.23
Lower legs 39 (80) 423 (69) 2.51 (1.18–5.31) 0.02
Feet 11 (22) 175 (29) 0.94 (0.45–1.97) 0.88

*OR, odds ratio; CI, confidence interval. OR (95% CI) adjusted for age and location; boldface indicates statistical significance; – indicates that ORs could not be calculated.
Fisher exact test for small numbers.

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