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Leigh F. Trevillian, PhD, MBBS, MPH, Anne-Louise Ponsonby, PhD, MBBS, Terence Dwyer, MD, MBBS, MPH, Andrew Kemp, PhD, MBBS, Jennifer Cochrane, BA, Lynette L.-Y. Lim, PhD, MSc, BSc and Allan Carmichael, MD, MBBS

Leigh F. Trevillian and Lynette L.-Y. Lim are with the National Centre for Epidemiology and Population Health, Australian National University, Canberra, Australian Capital Territory, Australia. Anne-Louise Ponsonby is with the National Centre for Epidemiology and Population Health, Australian National University, and the Menzies Centre for Population Health, University of Tasmania, Hobart, Tasmania, Australia. Terence Dwyer and Jennifer Cochrane are with the Menzies Centre for Population Health, University of Tasmania. Andrew Kemp is with the Department of Allergy, Immunology and Infectious Diseases, Children’s Hospital, Westmead, and the Discipline of Paediatrics and Child Health, University of Sydney, Sydney, New South Wales, Australia. Allan Carmichael is with the Department of Paediatrics and Child Health, University of Tasmania.

View larger version (14K): [in a new window]   FIGURE 1—— Relationship between number of environmental factors (bedroom heating, recent bedroom painting, absence of bedroom carpeting) and potentiation of composite bedding–wheezing effect by bedding combinations BC0, BC1, and BC2. Note. The reference category, bedding combination 0 (BC0), represented no use of synthetic items or sheepskin. Bedding combination 1 (BC1) comprised 1 synthetic item only (n = 279), 1 sheepskin only (n = 121), or 1 synthetic item and 1 sheepskin (n = 113). Bedding combination 2 (BC2) comprised 2 or more synthetic items without sheepskin (n = 57) or with sheepskin (n = 14). The difference in effect for potentiation of the BC1–wheezing effect from 0 to 2 or more of the environmental factors was P = .017. The difference in effect for potentiation of the BC2–wheezing effect from 0 to 2 or more of the environmental factors was P = .012. OR = odds ratio.