Mean symptom scores. Mean symptom scores recorded before the introduction of inhaled sodium cromoglicate and for the first eight weeks after introduction. Symptoms (22 in total) are grouped according to organ systems. Symptoms are recorded daily by patient using a 0-4 scale. Columns are mean scores for two weeks. Error bars are standard error of means. Key: solid black columns - before the introduction of inhaled sodium cromoglicate. First eight weeks after the introduction of inhaled sodium cromoglicate; solid white columns - weeks 1 and 2; columns with horizontal lines - weeks 3 and 4; columns with vertical lines - weeks 5 and 6; columns with diagonal lines - weeks 7 and 8.