Table 4

Results of Spearman correlation analysis between potential confounding factors and D

Predictor Coefficient p Value
Percentage of patients with LOC/PTA (selection bias)−0.67920.011
Percentage of CT scans (verification bias)−0.64720.017
Skull radiograph compared with CT for fracture diagnosis0.25350.403
Prospective studies v retrospective studies0.49000.089
Adult populationv all ages0.09760.751
  • See equation 4 for the definition of D.