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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