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© 1985 Oxford University Press

research-article

Variations in National Health Care Practices and Behaviours and Their Influence on International Research

N J THOMPSON, D E SNIDER, JR and L S FARER

Division of Tuberculosis Control, Center for Prevention Services, Centers for Disease Control Atlanta, Georgia 30333, USA. Reprint requests to: Technical Information Services, Center for Prevention Services, Centers for Disease Control, Atlanta, Georgia 30333, USA.

Thompson N J (Division of Tuberculosis Control, Center for Prevention Services, Centers for Disease Control, Atlanta, Georgia 30333, USA), Snider Jr D E and Farer L S. Variations in national health care practices and behaviours and their influence on international research. Internationa Journal of Epidemiology 1985, 14: 457–462.

Multinational clinical trials are valuable to the understanding of global health problems, but they pose special problems. Our experience with a multinational trial of isoniazid (INH) preventive therapy for tuberculosis revealed marked variation among the seven participating countries in the amount of tuberculosis screening prior to the trial; this variation contributed to the observed differences in the risk of tuberculosis among the countries. The incidence of drug side-effects, and the proportion of participants who complied with and completed treatment also varied significantly from country to country. These differences in completion and compliance served to differentially alter the expected risk of tuberculosis among the three regimens being studied. For all factors investigated, variation from country to country was greater than variation from dispensary to dispensary within a country. This suggests that cultural and other national characteristics are more potent determinants of health care practices and behaviours than patient and health care practitioner characteristics.

Received 1 December 1984


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