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Table 2 Effect of motivations to participate in health research on nonparticipation in the influenza vaccination study among elderly individuals (results of multivariable logistic regression analyses)

From: Motivations for (non)participation in population-based health studies among the elderly – comparison of participants and nonparticipants of a prospective study on influenza vaccination

  Total samplea Subsamplea b
Items n AOR (95% CI)c p value n AOR (95% CI)c p value
The study should contain few medical interventions such as taking of blood samples.
 important 183 3.01 (1.71–5.31) <0.0001 108 3.53 (1.71–7.26) 0.001
 so-so 127 0.99 (0.57–1.73) 0.98 93 1.29 (0.62–2.70) 0.50
 not important 141 Ref.   99 Ref.  
The study should not take up too much of my time.
 important 175 2.19 (1.27–3.78) 0.005 103 2.77 (1.34–5.70) 0.006
 so-so 143 1.27 (0.74–2.18) 0.39 105 1.62 (0.78–3.37) 0.20
 not important 133 Ref.   92 Ref.  
I receive information about my health.
 important 368 Ref.   241 Ref.  
 so-so 56 2.50 (1.20–5.20) 0.01 39 2.58 (1.08–6.15) 0.03
 not important 27 3.32 (1.12–9.81) 0.03 20 3.44 (1.01–11.77) 0.049
The study is reviewed and approved by the data security authorities.
 important 324 Ref.   210 Ref.  
 so-so 42 2.45 (1.08–5.55) 0.03 29 3.08 (1.18–8.05) 0.02
 not important 85 1.54 (0.84–2.82) 0.10 61 2.14 (1.02–4.52) 0.045
I make a contribution to society by participating in the study.
 important 347 Ref.   223 Ref.  
 so-so 79 2.43 (1.29–4.59) 0.006 57 3.90 (1.89–8.03) <0.0001
 not important 25 2.54 (0.86–7.49) 0.09 20 4.95 (1.55–15.77) 0.007
Sex
 Female 205 1.87 (1.20–2.91) 0.006 122 1.82 (1.02–3.22) 0.04
 Male 246 Ref.   178 Ref.  
Diabetes mellitus
 Yes 59 1.82 (0.90–3.66) 0.10 42 2.27 (1.03–4.99) 0.04
 No 392 Ref.   258 Ref.  
Self-perceived health status
 Poor/fair 83 3.53 (1.54–8.09) 0.003 62 4.00 (1.42–11.30) 0.009
 Good 310 2.07 (1.19–3.59) 0.01 202 2.30 (1.12–4.73) 0.02
 Very good/excellent 58 Ref.   36 Ref.  
  1. AOR adjusted odds ratio, CI confidence intervals
  2. aBackward elimination procedure based on the Wald test was applied to create the final model
  3. bThe nonparticipants whose main reason for nonparticipating in the influenza vaccination study was having been already vaccinated against influenza were excluded (see sensitivity analysis in the Methods section)
  4. cAdjusted for all other variables in the table