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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