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Table 1 Structure and content of the psychosocial correlates included in the psychosocial questionnaire

From: Mediators of physical activity change in a behavioral modification program for type 2 diabetes patients

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
  External regulation 4 .79 I do PA because other people tell me that I have to
  Introjected regulation 3 .80 I feel guilty when I do not do PA
  Identified regulation 4 .73 I do PA because it is good for my overall health
  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?
  Modeling from friends 2 .71 How frequently do friends participate in PA?
  Modeling from general practitioner 1   How frequently does you general practitioner participate in PA?
  Social norm from family 2 .77 Do your family members think you should participate in PA?
  Social norm from friends 2 .75 Do your friends think you should participate in PA?
  Social norm from general practitioner 1   Does you general practitioner think you should participate in PA?
  Social support from family 2 .73 How often does your family invite you to do PA together with them?
  Social support from friends 2 .75 How often do your friends encourage you to be physically active?
  Social support from partner 2 .79 How often does your partner encourage you to be physically active?
  General self-efficacy 1   I think I can be regularly active
  Self-efficacy towards barriers of PA 16 .92 I think I can be physically active, even if I am not feeling well
  Perceived benefits: appearance 3 .65 Feeling more attractive
  Perceived benefits: psychological 5 .87 Feeling less tense and stressed
  Perceived benefits: health 7 .85 Improving my longs and the condition of my heart
  Perceived benefits: pleasure 3 .57 Having fun
  Perceived benefits: social 2 .67 Having the chance to meet new people
  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
  Perceived barriers: health 7 .90 Lack of good health (injury, sickness,...)
  Perceived barriers: psychological 6 .76 Having personal problems
  Perceived barriers: diabetes-related 5 .84 Fear of going into hypoglycemia when doing PA
  Perceived barriers: lack of interest 8 .80 Lack of interest in PA
  Perceived barriers: external 6 .82 Lack of PA facilities
  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?
  1. Note: all items were rated on a five-point Likert scale except for self-efficacy towards barriers of physical activity (three-point scale)PA = physical activity