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A retrospective case-control study was performed in New Orleans, Louisiana, in 1985-1986 to test the hypotheses that 1) criminality is a risk factor for severe injury, and 2) the association between criminality and injury can be explained in terms of a common underlying factor--increased sensation-seeking tendencies. A total of 140 males with spinal cord injury were individually matched with 140 driver's license holders on age, race, sex, educational attainment, and zip code of residence and were interviewed by telephone. Criminality prior to spinal cord injury was measured by self-report and police records, and sensation seeking was measured by the Disinhibition and Boredom Susceptibility subscales of Zuckerman's Sensation-Seeking Scale (Form V). Those with spinal cord injuries were significantly more likely than controls to report a history of juvenile delinquency, adult criminality, and incarceration prior to the time of spinal cord injury. Statistically significant but modest difference were also found between cases and controls with respect to Disinhibition, Boredom Susceptibility, and the combined Sensation-Seeking Scale score. Matched-pairs logistic regression analysis indicated that the association between sensation seeking and spinal cord injury remained significant after controlling for criminality, with an estimated relative risk of 2.05 (95% confidence interval 1.67-2.53). However, the association between criminality and spinal cord injury also remained significant after controlling for sensation seeking (estimated relative risk = 2.04, 95% confidence interval 1.09-3.82). On the basis of these results, criminality and sensation seeking may be statistically significant but independent predictors of spinal cord injury.