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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