Computer-Familiar Computer-Naïve Wilcoxon signed rank test (p value) Spearman rank correlation (R) Wilcoxon signed rank test (p value) Spearman rank correlation (R) GPTD 0.14 0.55 (p=0.00) 0.11 0.32 (p=0.01) False positive response rate 0.05 0.23 (p=0.04) 0.95 0.24 (p=0.04) Test time 0.08 0.73 (p=0.00) 0.25 0.59 (p=0.00) GPTD: Global Probability of True Defect.

Table 2: Comparison of baseline and repeat performance measures stratified according to computer experience.