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Table 1 Hypothesized distribution of correct answers after 4 weeks between the two study groups

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

Categories* (numbers of correct answers)

Frequency tree

2 × 2 table

0

0.40

0.30

1

0.15

0.05

2

0.15

0.05

3

0.10

0.20

4

0.10

0.20

5

0.10

0.20

  1. * category 0 = 0 answers correct category 1–5 = 1–5 answers correct