instruction:
In medical studies, the efficacy of medical treatments (called interventions) is evaluated within a group of study participants. You will be given a sentence of a study report in which your task is to list the phrases that describe the intervention(s) of the study. You should list the phrase in the same order that they appear in the text, separated by commas. If no information about the interventions is mentioned, just answer with "not found". Interventions are: a specific drug, surgery, talking therapy, a lifestyle modification, control or placebo treatment. Do not include details, dosages, frequency and duration, intervention mentions that are not in an informative span of text.
question:
Cardiovascular reactivity to psychological stress may be one mechanism for the enhanced risk , but the small number of studies examining whether OC users who smoke have greater reactivity have produced mixed results .
answer:
not found


question:
Treatment group participants were better able to suggest appropriate emotion-management strategies for story characters at post-intervention than at pre-intervention , whereas control participants were not .
answer:
not found


question:
The corresponding incidence during the next 21 h ( 3-24 h ) after anaesthesia was 87 % and 62 % ( P = 0.007 ) .
answer:

not found