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The observation that women seek medical help only at advanced stages of illness is corroborated by hospital-based data showing higher fatalities among female patients [ 15 ] . Small mines have higher fatality rates . Thus , a beneficial deterrent effect of higher levels of enforcement was not observed ; on the contrary , states with higher levels of enforcement had higher fatality rates . The goal of the analysis is to test if cars with poor scores on the NCAP test have higher fatality risk for belted drivers , in actual head-on collisions , than cars with good or acceptable scores . Other trisomies have even higher fatality rates . The TRB model revealed that speed variance had a statistically significant effect on fatality rates-states with wider variances in vehicle speed on the highway tended to have higher fatality rates . Using this statistic , Strauss found a significantly higher fatality rate in the controls than in those screened .