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Table 3 Numbers of correct solutions of positive predictive values*

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

Category Training session Follow-up examination
  Frequency tree
(n = 94)
2 × 2 table
(n = 90)
Frequency tree
(n = 74)
2 × 2 table
(n = 75)
0–1
(0–1 answer correct)
19(20) 18(20) 53 (72) 50 (67)
2–3
(2–3 answers correct)
20 (21) 20 (22) 2 (3) 5 (7)
4–5
(4–5 answers correct)
55 (59) 52(58) 19 (26) 20(27)
  1. * Values are numbers (percentages) of participants