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Volume 14, Number 2—February 2008

Research

Effectiveness of Personal Protective Measures to Prevent Lyme Disease

Marietta Vázquez*Comments to Author , Catherine Muehlenbein*, Matthew Cartter†, Edward B. Hayes‡, Starr Ertel†, and Eugene D. Shapiro*
Author affiliations: *Yale University School of Medicine, New Haven, Connecticut, USA; †State of Connecticut Department of Public Health, Hartford, Connecticut, USA; ‡Centers for Disease Control and Prevention, Fort Collins, Colorado, USA;

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Table 3

Personal protective measures and risk factors for Lyme disease, Connecticut, July 2000 through February 2003

Personal protective measures Case-patients, no. (%) Matched controls, no. (%) Odds ratio* (95% CI)† p value
Use of protective clothing while outdoors
Definite 215 (46)
N = 467 427 (59) 
N = 724 0.6 (0.5–0.7) <0.0001
Definite and possible 265 (46) 
N = 572 524 (58) 
N = 898 0.6 (0.5–0.8) <0.0001
Unlikely
72 (53) 
N = 137
121 (53) 
N = 230
0.9 (0.6- 1.3)
0.55
Use of tick repellents on skin or clothing while outdoors
Definite 138 (30) 
N = 467 252 (35)
N = 724 0.8 (0.6–0.9) 0.04
Definite and possible 168 (29) 
N = 570 303 (34)
N = 890 0.8 (0.6–0.99) 0.0499
Unlikely
37 (27)
N = 136
64 (28)
N = 228
0.9 (0.6–1.5)
0.83
Spraying property with tick acaricides
Definite 16 (7) 
N = 237 52 (11) 
N = 467 0.6 (0.3–1.1) 0.09
Definite and possible 19 (7) 
N = 285 62 (11) 
N = 557 0.6 (0.3–1.0) 0.06
Unlikely
3 (8)
N = 36
16 (12) 
N = 133
0.7 (0.2–3.0)
0.61
Checking the body for ticks after exposure
Definite 360 (77) 
N = 467 560 (77) 
N = 724 1.1 (0.8–1.4) 0.64
Definite and possible 443 (77) 
N = 572 703 (78) 
N = 898 1.0 (0.8–1.4) 0.81
Unlikely 107 (78) 
N = 137 181 (79)
N = 230 0.9 (0.5–1.5) 0.61

*All estimates were adjusted for possible confounders (sex, race, receipt of Lyme vaccine, and use of other personal protective measures) with conditional logistic regression.
†CI, confidence interval.

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