Table 4

Validation statistics for the risk-prediction algorithm in the validation cohort

Mean (95% CI)
Females
  R2 statistic,a %71.70 (70.30 to 73.10)
  D statisticb3.25 (3.15 to 3.37)
  ROC statisticc0.92 (0.91 to 0.93)
Males
  R2 statistic,a %72.11 (71.04 to 73.18)
  D statisticb3.29 (3.20 to 3.38)
  ROC statisticc0.92 (0.91 to 0.93)
  • a R2 statistic shows explained variation in time to diagnosis of lung cancer — higher values indicate more variation is explained.

  • b D statistic is a measure of discrimination — higher values indicate better discrimination.

  • c ROC statistic is a measure of discrimination — higher values indicate better discrimination.