Mortality, survival and prevalence: traumatic spinal cord injury in Olmsted County, Minnesota, 1935-1981

Abstract

Mortality, prevalence, and survival from traumatic spinal cord injury were examined in Olmsted County, Minnesota, from 1935 through 1981. One hundred and fifty-four incident cases and 30 additional cases who were Olmsted County residents on at least one of four prevalence dates were identified. The average annual age-adjusted mortality for spinal cord injury, including deaths attributable to spinal cord injury occurring at any time after injury was 28.5 per million population. The rates in males were consistently greater than females, peaking to 61.0 in the period 1965-74. Thirty-eight percent of cases did not survive long enough to be hospitalized. Survival was 58% in the first week post-injury. However, for those who survived the first day and the first year, the 10-year survival was 77 and 87%, respectively. Early fatality in males was associated with single marital status (p = 0.0033) and concomitant head trauma (p = 0.0122), and in females with pedestrian or bicyclist status at injury (p less than 0.0001). Long-term survival was dependent on age (p less than 0.0001) and functional disability (p = 0.04). Point prevalence of spinal cord injured patients increased from 197 per million population in 1950 to 473 in 1980. This increase in prevalence was due at least in part to increasing incidence over time. An improvement in survival over the time period of the study could not be detected.