[The scientific information that the pharmaceutical industry provides to family doctors].
OBJECTIVE: To check whether the information in the written publicity that the pharmaceutical industry gives to family doctors really is based on the scientific studies that support it. DESIGN: Cross-sectional study. SETTING: Health centre on the outskirts of a big city. PARTICIPANTS: Over a year, all the scientific studies that laboratory reps gave family doctors along with the advertising for medicines were collected. A total of 63 paired studies and advertising pieces were obtained. MAIN MEASUREMENTS: 1-3 advertising messages with each supporting study were selected and reviewed in a structured fashion. Then whether or not the messages selected were based on the study was appraised. RESULTS: 44.5% of the advertising messages were not based on the accompanying study; 29.9% clearly were based on the study; and in the rest there was a half-and-half relationship. There was a significant relationship between the evaluation of the advertising messages and the kind of study, masking and the kind of result variable. CONCLUSIONS: A high proportion of advertising messages are not based on the study that is reputed to support them. A critique of these studies has to be undertaken before the advertising messages can be looked at.