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Table 1 Background characteristics (%), in the background population and in the participant sample, before and after reweighting

From: Can the validity of a cohort be improved by reweighting based on register data? Evidence from the Swedish MDC study

 

Population (n = 71,447)

Participants (n = 28,096)

Participants, reweighted

Socio-demographics

 Age

 40–45

11

10

11

 46–50

23

21

23

 51–55

19

19

19

 56–60

18

18

18

 61–64

19

22

19

 65–67

10

9.8

10

 Female

58

61

58

 Country of birth

 Sweden

79

88

80

 Other Nordic

4.7

4.0

4.8

 Other EU15

3.0

2.5

3.0

 Other EU

5.3

2.9

5.2

 Other Europe

4.7

1.5

4.5

 Outside Europe

3.0

1.1

2.7

 Civil status

 Married

60

66

60

 Unmarried

12

9.3

12

 Divorced

21

18

21

 Widowed

7.3

6.9

6.9

 Education

 Primary

44

37

42

 Short secondary

27

29

28

 Long secondary

11

13

11

 Tertiary

18

21

19

 Employment status

 Employed

55

63

56

 Unemployed

9.0

5.6

8.1

 Sickness absence

5.2

4.5

5.3

 Retired

31

27

30

 Disposable income

 Quintile 1

20

15

19

 Quintile 2

20

17

20

 Quintile 3

20

21

20

 Quintile 4

20

23

21

 Quintile 5

20

24

21

Disease history

 Circulatory

8.2

7.3

8.2

 Diabetes

1.2

0.80

1.2

 Neoplasms

5.2

5.4

5.4

 Respiratory

2.9

2.4

2.9

 Digestive

7.2

6.9

7.1

 Mental

4.1

2.1

4.1

  1. Age refers to age in 1990. Disposable income was adjusted for inflation using the KPI index from Statistics Sweden. Disease history assumes the value of one if the individual was hospitalized for the disease type in question between 1987 and the baseline examinations in the MDC study