Average annual mortality rates (age-adjusted to the 1950 population of the United States) were calculated using data from 1967–1973 collected through the auspices of the World Health Organization. Mortality rates (deaths/100,000/year) ranged from 0.1 to 2.1 (mean 1.0). Despite international variations in the completeness of case ascertainment and diagnostic accuracy, these data reveal interesting patterns. Ireland, Northern Ireland, and Scotland had the highest rates, while Mexico, the Philippines, and Japan had the lowest. Data from 1967–1973 were available from an adequate number of countries in the Northern Hemisphere to reveal a pattern essentially similar to that reported previously: rates were higher for countries in the temperate zone of the Northern Hemisphere than for nations in the tropics or subtropics. Most areas showed at least a small decline in mortality from the 1950s to the 1970s.