Document Classification

Section Type: RESULTS

Text: Der p 1 levels in crib mattress and nursery floor in the active group were extremely low (crib mattresses geometric mean [95 % CI] 2. 3 ng [1. 6-3. 4] at birth, 6. 8 ng [4. 5-10] at age 6 months, and 15. 6 ng [9. 8-24. 8] at age 1 year [active vs control, P =. 001] ; nursery 1 ng [0. 9-1. 1] at birth, 1. 7 ng [1. 2-2. 5] at age 6 months, and 2 ng [1. 3-3. 5] at age 1 year [active vs control, P <. 00001]).