Table I.
Items and Cronbach coefficient alpha reliabilities for intention, identification and attitude scales
| Standardized Cronbach coefficient alpha | |
|---|---|
| Intention to improve physical activity | |
| How likely are you to do 150 min of moderate to vigorous physical activity each week over the next month? | 0.64 |
| How likely are you to be more physically active in the next month than you have been in the past 6 months? | |
| Intention to improve diet | |
| How likely are you to eat healthy in the next month by reducing high-fat foods? | 0.87 |
| How likely are you to eat healthy in the next month by reducing high-sugar foods? | |
| How likely are you to eat healthy in the next month by reducing high-carbohydrate foods? | |
| How likely are you to make changes to your diet that will improve your health? | |
| Identification with persons in the photographsa | |
| I cannot/can relate to them. | 0.91 |
| I see them as different/similar from me. | |
| They do not look like/look like me. | |
| I do not feel/feel connected to them. | |
| Positive outcome expectations for physical activity | |
| Physical activity makes me feel better. | 0.81 |
| Physical activity gives me a sense of personal accomplishment. | |
| Physical activity will aid in weight control. | |
| If I increase my physical activity, I expect to be happier. | |
| If I increase my physical activity, I expect to have more self-respect. | |
| Negative outcome expectations for physical activity | |
| Physical activity makes me extremely tired. | 0.64 |
| Doing physical activity is boring. | |
| I experience a lot of pain when I am physically active. | |
| When I am physically active, I become resentful of those that are more fit than me. | |
| Self-efficacy for physical activity | |
| If I increase my physical activity, I expect to have control of my overall health. | 0.70 |
| I feel I have control over my physical activity levels. | |
| How certain are you that you can be physically active? | |
| How confident are you that you can do moderate or vigorous intensity physical activity for at least 10 min a day? | |
| Positive outcome expectations for dietary changes | |
| Eating healthy makes my mood better, in general. | 0.87 |
| Eating healthy gives me a sense of personal accomplishment. | |
| Eating healthy increases my energy. | |
| If I improve my diet, I expect to enjoy life more. | |
| If I improve my diet, I expect to feel self-confident. | |
| Negative outcome expectations for dietary changes | |
| Eating healthy is boring. | 0.69 |
| I still have cravings for junk food when I eat healthy. | |
| Healthy foods like fruits and vegetables just do not fill me up. | |
| Finding healthy foods is inconvenient and hard to do. | |
| Self-efficacy for dietary changes | |
| If I improve my diet, I expect to be in control of my health. | 0.75 |
| I feel that I have control over the changes I make to my diet. | |
| How certain are you that you can eat healthy foods such as those that are low in fat, sugar and carbohydrates? | |
| How confident are you that you will be able to improve your diet in the future? | |
a
Identification was measured with bipolar adjective scales; opposing adjectives are listed within each item.