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Table 2 Hypothetical population distribution in Scania

From: Efficiency of two-phase methods with focus on a planned population-based case-control study on air pollution and stroke

  

Group-level exposure probabilities for 12 areas* within the categories Low Medium and High (%)

Smoking prevalence within exposure categories † (%)

 

Area*

1

2

3

4

5

6

7

8

9

10

11

12

 
 

Low**

92

89

88

85

77

60

40

35

32

20

20

16.5

5

Exposure category

Medium**

7

10

60

14

20

37

30

60

42

75

18

18.5

25

 

High**

1

1

5

1

3

3

30

5

26

5

62

65

40

First-phase control distribution (%)

2

9.5

3

7

0.5

4

5

12

15

6

1

35

 
  1. * The areas represent 12 municipalities in Scania, Southern Sweden.
  2. ** Overall exposure prevalence to the categories Low, Medium and High was 40%, 30% and 30%, respectively.
  3. † Overall smoking prevalence in the population is 22%.