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Table 2 Baseline characteristics*

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

Age   
  Frequency tree
(n = 94)
2 × 2 table
(n = 90)
Median (range) 29 (20–54) 26 (19–51)
Missing values 3 (3) 2 (2)
Gender   
Male 15 (16) 20 (22)
Female 77 (82) 67 (75)
Missing values 2 (3) 3 (3)
Years of school   
< 10 years 1 (1) 1 (1)
10–12 years 22 (23) 19 (21)
> 12 years 68 (72) 67 (75)
Missing values 3 (3) 3 (3)
Mark in mathematics   
1 (highest level) 6 (6) 6 (7)
2 20 (21) 18 (20)
3 35 (37) 32 (36)
4 14 (15) 17 (19)
5 (lowest level) 5 (5) 9 (10)
Missing values 14 (15) 8 (9)
Group   
University of Hamburg 59 (63) 55 (61)
Vocational College 14 (15) 15 (17)
Non-academic students 21 (22) 20 (22)
  1. *Values are numbers (percentages) of participants unless stated otherwise