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. 2006 Jul 27;114(11):1684–1689. doi: 10.1289/ehp.9168

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Piperonyl butoxide in 2-week integrated air samples. (A) Changes in mean (± SE) piperonyl butoxide levels in 2-week integrated indoor air samples collected over 2 weeks before and 2 weeks after the intervention. Intervention (n = 23), control (n = 24). (B) Percent reduction in piperonyl butoxide levels between 2-week integrated indoor air samples collected over 2 weeks before and 2 weeks after the intervention. Intervention (n = 23), control (n = 24). Comparison of differences in percent reduction in piperonyl butoxide levels between the intervention and control groups, group t-test, p = 0.3) (B).

*Wilcoxon signed-rank test, p = 0.016.