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Identity plots. The paper questionnaires plotted against the online versions for the a) Asthma Control Questionnaire (ACQ) and b) Asthma Quality of Life Questionnaire (AQLQ). The x=y line depicts an identical result for the paper and online versions. The agreement between the two versions is acceptable if the measurement falls between the upper and lower limits of the minimal clinically important difference (MCID) (mean difference ±0.5).
