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Table 4: 
Radiographic factor combinations that predict a diagnosis of tortuosity
Radiographic Factor CombinationConcordance StatisticSensitivitySpecificity
Factors 5 & 6.90389 (CI .79–1)93 (CI .86–1)
Factors 3, 5, & 6.91185 (CI .66–1)93 (CI .86–1)
Factors 3 & 6.89885 (CI .66–1)91 (CI .83–.98)
Factor 5.82693 (CI .83–1)80 (CI .64–.94)
Factor 6.83293 (CI .83–1)76 (CI .58–.91)
Factor 3.78089 (CI .71–1)69 (CI .46–.86)
  • Note:—CI indicates 95% confidence interval.