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)
| 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. | ||
AOR adjusted odds ratio, CI confidence intervals
aBackward elimination procedure based on the Wald test was applied to create the final model
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)
cAdjusted for all other variables in the table