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Volume 15, Number 2—February 2009
CME ACTIVITY - Research

Face Mask Use and Control of Respiratory Virus Transmission in Households

C. Raina MacIntyreComments to Author , Simon Cauchemez, Dominic E. Dwyer, Holly Seale, Pamela Cheung, Gary Browne, Michael Fasher, James Wood, Zhanhai Gao, Robert Booy, and Neil Ferguson
Author affiliations: University of New South Wales School of Public Health and Community Medicine, Sydney, New South Wales, Australia (C.R. MacIntyre, H. Seale, J. Wood, Z. Gao); Children's Hospital at Westmead, The University of Sydney, Sydney (C.R. MacIntyre, P. Cheung, R. Booy, G. Browne); Imperial College London, London, UK (S. Cauchemez, N. Ferguson); Westmead Hospital, Sydney (D.E. Dwyer); The Wentworth Division of General Practice, Sydney (M. Fasher)

Main Article

Table 5

Estimates of hazard ratios for ILI in the study*

Variable Global effect of mask use
 Effect per mask type
Hazard ratio (95% CI) p value Hazard ratio (95% CI) p value
1-d incubation period
Adherence to use of surgical or P2 mask† 0.26 (0.09–0.77) 0.015‡
Adherence to use of surgical mask† 0.27 (0.06–1.24) 0.09
Adherence to use of P2 mask† 0.24 (0.05–1.08) 0.06
No. adults 1.07 (0.66–1.71) 0.80 1.06 (0.66–1.71) 0.80
No. siblings 0.86 (0.55–1.35) 0.52 0.86 (0.55–1.35) 0.52
Index patient <5 y of age 0.88 (0.41–1.89) 0.75 0.88 (0.41–1.89) 0.74
Frailty§
0.005‡
0.004‡
2-d incubation period
Adherence to use of surgical or P2 mask† 0.32 (0.11–0.98) 0.046‡
Adherence to use of surgical mask† 0.18 (0.02–1.38) 0.099
Adherence to use of P2 mask† 0.45 (0.12–1.62) 0.22
No. adults 1.13 (0.71–1.81) 0.60 1.14 (0.71–1.82) 0.59
No. siblings 0.80 (0.51–1.27) 0.34 0.80 (0.50–1.27) 0.34
Index patient <5 y of age 1.02 (0.46–2.24) 0.96 1.02 (0.47–2.25) 0.95
Frailty§ 0.004‡ 0.004‡

*ILI, influenza-like illness; CI, confidence interval.
†Time-dependent variable.
‡p<0.05 significant (indicates that the outcome for 1 person is correlated with the outcome of other persons in the household).
§This term measures if the clustering of subjects in households is relevant to quantify the risk of ILI infection.

Main Article

Page created: September 24, 2012
Page updated: September 24, 2012
Page reviewed: September 24, 2012
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