Sixty male patients with myocardial infarction were compared to a similar number of patients with noncardiovascular disease on scales measuring Type A behaviour (TAB) and neuroticism. No significant differences emerged. Differences in TAB were observed in relation to nationality and there was a positive correlation between TAB and neuroticism. TAB is discussed in the light of sociocultural variations and the suggestion is made that TAB might be a culture-bound cluster of characteristics.