COMPARATIVE STUDY
JOURNAL ARTICLE
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Differences in cause-specific patterns of unintentional injury mortality among 15-44-year-olds in income-based country groups.

OBJECTIVES: The aim of the present study was to investigate the cause-specific patterns of unintentional injury mortality among 15-44-year-olds in various income-based country groups, and to analyze which specific causes contribute the most to the unintentional injury mortality in each country group.

MATERIALS AND METHODS: Cross-sectional data on the five most common causes of unintentional injury mortality by age-sex specific subgroups were compiled for 57 countries from the World Health Statistics Annuals for the year 1993 (1991-1994 if information for 1993 was unavailable). Data were categorized into four income-based country groups according to their gross national product (GNP) per capita for the year 1993. The differences between means and rate ratios of low, lower-middle, and upper-middle income countries were calculated by comparing them with those of the high-income countries. Regression analysis was performed to determine the trends in the direction of income for each specific cause of unintentional injury mortality by age-sex.

RESULTS: For any of the specific causes of unintentional injury mortality there was an inverse relationship between mortality rates and GNP per capita except for motor vehicle traffic (MVT) among the 15-24-year-old age group. MVT accidents were the most common cause and contributed 26-77% of all unintentional injury mortality. The second most common cause was poisoning in all country groups except low-income countries where drowning dominated for males and mixed causes for females. Upper-middle income countries represented the highest MVT mortality in all age-sex subgroups except among 15-24-year-old females for which high-income countries displayed the highest rate. For other causes, lower-middle income represented the highest rates with a few exceptions. In the 15-24-year age group, the rate ratio of motor vehicle traffic mortality was higher in high-income countries compared to low-income countries, while in the 35-44-year age group, all other country groups showed a higher rate ratio than high-income countries. Drowning for males and burns for females in the low and middle-income countries were significantly higher than in high-income countries.

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