Table 1 Structure and content of the psychosocial correlates included in the psychosocial questionnaire
Theory or model | Psychosocial construct/scale | Number of items | Chronbach's alpha | Example of item |
|---|---|---|---|---|
Self-determination theory [8] | Amotivation | 4 | .83 | I do not understand why I should do any PA |
| Â | External regulation | 4 | .79 | I do PA because other people tell me that I have to |
| Â | Introjected regulation | 3 | .80 | I feel guilty when I do not do PA |
| Â | Identified regulation | 4 | .73 | I do PA because it is good for my overall health |
| Â | Intrinsic regulation | 4 | .86 | I do PA because it is fun |
Social cognitive theory [6] | Modeling from family | 2 | .78 | How frequently do family members participate in PA? |
| Â | Modeling from friends | 2 | .71 | How frequently do friends participate in PA? |
| Â | Modeling from general practitioner | 1 | Â | How frequently does you general practitioner participate in PA? |
| Â | Social norm from family | 2 | .77 | Do your family members think you should participate in PA? |
| Â | Social norm from friends | 2 | .75 | Do your friends think you should participate in PA? |
| Â | Social norm from general practitioner | 1 | Â | Does you general practitioner think you should participate in PA? |
| Â | Social support from family | 2 | .73 | How often does your family invite you to do PA together with them? |
| Â | Social support from friends | 2 | .75 | How often do your friends encourage you to be physically active? |
| Â | Social support from partner | 2 | .79 | How often does your partner encourage you to be physically active? |
| Â | General self-efficacy | 1 | Â | I think I can be regularly active |
| Â | Self-efficacy towards barriers of PA | 16 | .92 | I think I can be physically active, even if I am not feeling well |
| Â | Perceived benefits: appearance | 3 | .65 | Feeling more attractive |
| Â | Perceived benefits: psychological | 5 | .87 | Feeling less tense and stressed |
| Â | Perceived benefits: health | 7 | .85 | Improving my longs and the condition of my heart |
| Â | Perceived benefits: pleasure | 3 | .57 | Having fun |
| Â | Perceived benefits: social | 2 | .67 | Having the chance to meet new people |
| Â | Perceived benefits: diabetes-related | 3 | .81 | Better monitoring of my diabetes |
Transtheoretical model [7] | Perceived barriers: age-related | 3 | .82 | I feel too old to do PA |
| Â | Perceived barriers: health | 7 | .90 | Lack of good health (injury, sickness,...) |
| Â | Perceived barriers: psychological | 6 | .76 | Having personal problems |
| Â | Perceived barriers: diabetes-related | 5 | .84 | Fear of going into hypoglycemia when doing PA |
| Â | Perceived barriers: lack of interest | 8 | .80 | Lack of interest in PA |
| Â | Perceived barriers: external | 6 | .82 | Lack of PA facilities |
| Â | Coping with relapse | 3 | .80 | Do you think you are able to make an inventory of high-risk situations that can contribute to relapse episodes? |