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Table 4 Analysis of each task regarding correct solutions, transfer of numerical information and Bayesian computations*

From: Explaining computation of predictive values: 2 × 2 table versus frequency tree. A randomized controlled trial [ISRCTN74278823]

  Correct solution
  Training session Follow-up examination
  frequency tree
(n = 94)
2 × 2 table
(n = 90)
frequency tree
(n = 74)
2 × 2 table
(n = 75)
Task A 67 (71) 66 (73) 18 (24) 25 (33)
Task B 63 (67) 64 (71) 22 (30) 24 (32)
Task C 69 (73) 63 (70) 19 (26) 23 (31)
Task D 67 (71) 54 (60) 21 (28) 23 (31)
Task E 43 (46) 50 (56) 18 (24) 20 (27)
  Correct transfer
  Training session Follow-up examination
  frequency tree
(n = 94)
2 × 2 table
(n = 90)
frequency tree
(n = 74)
2 × 2 table
(n = 75)
Task A 84 (89) 79 (88) 53 (72) 57 (76)
Task B 83 (88) 78 (87) 52 (70) 57 (76)
Task C 71 (76) 65 (72) 45 (61) 53 (71)
Task D 73 (78) 67 (74) 42 (57) 49 (65)
Task E 54 (57) 53 (59) 42 (57) 48 (64)
  Correct Bayesian Computation
  Training session Follow-up examination
  frequency tree
(n = 94)
2 × 2 table
(n = 90)
frequency tree
(n = 74)
2 × 2 table
(n = 75)
Task A 62 (66) 59 (66) 13 (18) 18 (24)
Task B 60 (64) 58 (64) 17 (23) 18 (24)
Task C 70 (75) 60 (67) 15 (20) 15 (20)
Task D 69 (73) 52 (58) 16 (22) 17 (23)
Task E 46 (49) 44 (49) 15 (20) 15 (20)
  1. * Values are numbers (percentages) of tasks