Changing patterns of mortality seasonality among the western James Bay Cree

Anglican Church of Canada burial records from 1851-1964 for the Moose Factory First Nation are analysed for mortality seasonality. The 113-year study period is subdivided into three death cohorts (1851-1906, 1914-1945 and 1946-1964) that broadly reflect the late 19th century, early 20th century, and the post-WWII periods, respectively. The data are partitioned into three age groups: infants (< 1), children (1-14), and adults (15+) to determine whether the hazards of death by season varied by age. The results show a clear and statistically significant pattern of seasonal mortality in the 19th century cohort for all three age groups, with a marked peak in mortality in the summer and a smaller peak in winter deaths (chi 2 = 84.82, df = 11, p < 0.001). By the early 20th century, the seasonal pattern disappears and the risks of death are consistent throughout the annual cycle (chi 2 = 16.5, df = 11, p = 0.124). It is argued that changes in the social and economic fabric of life, associated with the decline of the fur-trade, stimulated an epidemiologic transition among the Moose Factory Cree by the early 20th century, well in advance of WWII, the event normally used to mark both the onset of the phenomenon and improved health care delivery to the region.