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Table 2 Mortality and disease incidences (events per 10,000 person-years) in the background population and in the participant sample, before and after reweighting; the follow-up begins at baseline in 1991–1996 and ends at an event, death, emigration, or at the latest in the end of 2016

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
All-cause mortality
 Everyone 222 176 182
 Participation quintile 1 264 196 192
 Participation quintile 2 283 227 226
 Participation quintile 3 223 188 188
 Participation quintile 4 182 159 159
 Participation quintile 5 171 150 150
CVD mortality
 Everyone 76 58 62
 Participation quintile 1 94 72 71
 Participation quintile 2 103 82 82
 Participation quintile 3 76 64 64
 Participation quintile 4 60 48 48
 Participation quintile 5 53 46 46
Cancer mortality
 Everyone 72 63 64
 Participation quintile 1 70 63 61
 Participation quintile 2 84 71 70
 Participation quintile 3 74 66 66
 Participation quintile 4 67 62 62
 Participation quintile 5 66 58 58
CVD incidence
 Everyone 128 113 118
 Participation quintile 1 145 129 129
 Participation quintile 2 154 144 144
 Participation quintile 3 130 122 122
 Participation quintile 4 111 99 100
 Participation quintile 5 105 99 100
Cancer incidence
 Everyone 136 133 132
 Participation quintile 1 119 120 117
 Participation quintile 2 149 140 140
 Participation quintile 3 137 133 133
 Participation quintile 4 133 133 133
 Participation quintile 5 140 134 134
  1. Participation quintiles were defined based on the background population. There were 2374 participants in the first participation quintile, 4827 in the second, 5968 in the third, 7037 in the fourth, and 7890 in the fifth