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. Author manuscript; available in PMC: 2017 Jul 19.
Published in final edited form as: Ann Allergy Asthma Immunol. 2008 Nov;101(5):517–523. doi: 10.1016/S1081-1206(10)60291-8

FIG 1.

FIG 1

Distributions of Can f 1 and Fel d 1 concentrations in US homes. Box plots represent the 0, 25th, 50th, 75th, and 100th percentiles. The house index is the mean of the sample location concentrations. The dotted lines represent the proposed thresholds of exposure that have been associated with an increased risk of sensitization (>2 ug/g for Can f 1 and >1 ug/g for Fel d 1) and asthma symptoms in allergic patients (>10 ug/g for Can f 1 and >8 ug/g for Fel d 1).