[Use of the reliable change index to evaluate the effectiveness of clinical interventions: Application of an asthma training program].

Objective: To compare two methods for the evaluation of outcomes to assess effectiveness of a therapeutic intervention of a professional education program on asthma control.

Design: A naturalistic, intervention study in which asthmatic patients were attended by clinicians (IG group) who Had taken part in a special education program and a control group (CG) that received medical assistance from clinicians still waiting to be trained.

Location: Five urban Primary Care Health Centres of the same region.