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Table 2 Exploratory factor solutions showing the underlying dimensions of reasons for (a) participating and (b) not participating

From: Disparities in the participation and adherence of older adults in lifestyle-based multidomain dementia prevention and the motivational role of perceived disease risk and intervention benefits: an observational ancillary study to a randomised controlled trial

Items Factor loadings Items Factor loadings
1 2 3 1 2 3
(a) Reasons for accepting to participate (b) Reasons for refusing to participate
Factor 1: ‘Perceived benefits’ Factor 1: ‘Lack of interest’
To help me improve my diet .75    I do not see the point of exercising at my age .78   
To do physical activity .73    I do not think that memory exercises will have a beneficial effect on my memory .67   
To train my memory .72    I do not see the point of training my memory at my age .66   
To receive a preventive action .70    I do not think that exercising will have a beneficial effect on my memory .64   
I can see the point of changing my diet at this age .67    I do not see the point of changing my diet at my age .63   
To receive a new treatment .64    I do not think that changing my diet will have beneficial effects on my memory .61   
I can see the point of training my memory at this age .63    I do not see the point of helping research .56   
I can see the point of doing physical activity at this age .61    I do not feel concerned by memory disorders such as Alzheimer’s disease .52   
Factor 2: ‘Social influences’ Factor 2: ‘Lack of control’
Because someone else (e.g. family member/friend) advised me to take part in the program   .69   Because the treatment could possibly have negative effects on my health   .69  
Because a doctor invited me to take part in the program   .68   Because the treatment to be taken is still under study   .68  
Because a doctor in whom I have confidence invited me to take part in the program   .65   Because I can be compared to other people in the study   .67  
Taking part in the program will help to keep me busy   .61   I am worried that I will find out I have a memory disorder like Alzheimer’s disease   .64  
To meet other people and feel less lonely   .61   I do not want my information to be held   .60  
     Because I cannot choose which group I will be in   .59  
Factor 3: ‘Altruism and availability’ Factor 3: ‘Perceived constraints’
I have enough free time for this program    .66 Because the program lasts for several years    .81
In order to help move research forward and be useful to other people    .65 Because the program requires a lot of personal investment    .80
Because of intellectual curiosity and because I am interested in research    .53 I do not have enough time for the program    .74
Eigen values 4.94 3 2.24 Eigen values 4.96 4.76 2.54
Percentage of variance 20 12 9 Percentage of variance 16 15 8
  1. Only items which loaded on a single factor (loading > .50, and cross-loadings < .2) are shown in this table. Factor loadings for the full set of items are shown in Additional file 1: Appendix 2