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Table 4 Detailed Reasons for Baseline Non-participation Stated in 2009 or 2010a by Non-participants (n = 786)

From: Baseline participation in a health examination survey of the population 65 years and older: who is missed and why?

  Rank order total Rank order 2009 Rank order 2010 Total NP+ NP- NR
  (n = 786) (n = 603) (n = 183) (n = 786) (n = 298) (n = 305) (n = 183)
Detailed reasons (multiple reasons permitted) - %
Refusal to participate in scientific studies on principle 1 1 2 42.1 37.2 53.4 31.1
Too ill 2 2 2 31.4 38.3 24.9 31.1
No interest in this study 3 3 1 25.8 16.1 25.9 41.5
No timeb 4 4 4 12.5 18.1 7.5 11.5
Limited knowledge of Germanb 5 5 5 4.6 0.7 5.9 8.7
Dementia 6 11 6 3.1 3.4 1.0 6.0
Miscellaneousb 7 7 9 2.7 2.3 3.9 1.1
Too oldb 7 7 9 2.7 4.0 2.3 1.1
Participation too strenuousb 9 5  - 2.5 4.7 2.0 0.0
Family member too ill/ in need of careb 10 10 13 1.9 3.7 1.0 0.5
Hospital stay 10 9  - 1.9 2.3 2.6 0.0
Hearing/visual impairment 12 12 9 1.7 2.0 1.6 1.1
Personal reasons (not otherwise specified)b 13 13  - 1.1 1.7 1.3 0.0
Having sufficient medical careb 13 13  - 1.1 2.7 0.3 0.0
Having no personal benefitb 15 15  - 1.0 0.7 2.0 0.0
Too healthy 16 16  - 0.9 2.0 0.3 0.0
Death of a family memberb 16 16  - 0.9 1.3 1.0 0.0
Speech disorder 16 19 9 0.9 1.0 0.7 1.1
Being in residential care in 2009 16 25 7 0.9 0.0 0.3 3.3
Too busyb 20 18  - 0.8 1.3 0.7 0.0
Being absent during recruitment periodb 21 - 8 0.6 0.0 0.0 2.7
Participating in another scientific studyb 22 20 13 0.5 0.3 0.7 0.5
Being in rehabilitation 23 20  - 0.4 0.7 0.3 0.0
Being unmotivatedb 23 20  - 0.4 0.7 0.3 0.0
Bad experiences with scientific studiesb 23 20  - 0.4 0.0 1.0 0.0
Having concerns about the study’s risksb 26 24  - 0.3 0.3 0.3 0.0
  1. Abbreviations: NP + = non-participants with short questionnaire, i.e., individuals who declined study participation but completed the short questionnaire; NP- = non-participants without the short questionnaire, i.e., individuals who declined study participation and completing the short questionnaire; NR = non-respondents, i.e., individuals who could not be reached during the recruitment period and who did not actively decline study participation
  2. aReasons for non-participation stated during the 2009 recruitment period. In 2010, non-respondents were given an opportunity to report retrospectively a reason of non-participation
  3. bThese reasons were summarized as “other” if there was no indication of being too healthy or ill
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