Hak, E.

patient score allergen study der p 1 rhiniti group symptom p value difference der f 1 concentration change copyright 2003 massachusetts allergy control value asthma mattress effect bedding www.nejm.org measure level percent base-line scale symptom score control group exposure difference impermeable-cover group trial 12 months base line visual-analogue house-dust-mite allergen visual-analogue scale impermeable-cover society 12- bedroom reduction house-dust mites erasmu intervention massachusett copyright center severity netherland point impermeable november month universiteit 2003 downloaded atopic dermatitis floor biblio range downloaded england journal medisch result house right 232 patients allergen-provocation house-dust-mite immunol confidence table ratio avoidance end points interval analysis measurement outcome randomized