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Appendix Decisional balance and self-efficacy questionnaire items

From: The Transtheoretical model for fruit, vegetable and fish consumption: associations between intakes, stages of change and stage transition determinants

Concept

Items

Cronbach's α

Below several pros and cons of eating (fruits/fish/vegetables) are listed. How important are each of these pros and cons in your decision to eat two servings of fruit each day/200 grams of vegetables each day/fish once or twice a week

Pros of fruit

Fruit is good for your body

.79

 

Other people eat fruit

 
 

Fruit can substitute for unhealthy food products

 
 

Eating fruits can help one maintain weight

 
 

Fruit can help prevent diseases

 
 

Eating fruits makes one feel better

 
 

Fruits make a diet more varied

 
 

Eating fruits can help one lose weight

 

Pros of vegetable

Vegetables are good for your body

.75

 

Other people eat vegetables

 
 

Vegetables can substitute for unhealthy food products

 
 

Eating vegetables can help one maintain weight

 
 

Vegetables can help prevent diseases

 
 

Eating vegetables makes one feel better

 
 

Vegetables make a diet more varied

 
 

Eating vegetables can help one lose weight

 

Pros of fish

Fish is good for your body

.93

 

Fish can substitute meat

 
 

Fish can help prevent diseases

 
 

Fish can be used in a variety of dishes

 
 

Fish is nutritious

 
 

Fish can be bought in supermarkets

 
 

Fish is easily digested

 

Cons of fruit

Eating fruits is unhandy

.81

 

It is hard to find tasty fruits

 
 

It is difficult to store fruits

 
 

Eating fruits is tasteless

 
 

Eating fruits is expensive

 
 

Fruit spoils quickly

 
 

Recommendations for fruit are unclear

 
 

It takes time to buy fruits

 
 

Chemicals on fruit worry me

 

Cons of vegetable

Eating vegetables is unhandy

.82

 

It is hard to find tasty vegetables

 
 

It is difficult to store vegetables

 
 

Eating vegetables is tasteless

 
 

Eating vegetables is expensive

 
 

Vegetables spoil quickly

 
 

Recommendations for vegetables are unclear

 
 

It takes time to prepare vegetables

 
 

It is difficult to prepare vegetables

 
 

Chemicals on vegetables worry me

 

Cons of fish

Eating fish is tasteless

.84

 

Fish has an unpleasant smell

 
 

It is difficult to store fish

 
 

The bones in fish are unpleasant

 
 

It is difficult to find good quality fish

 
 

Recommendations for fish are unclear

 
 

Fish spoils quickly

 
 

Fish is difficult to prepare

 
 

Chemicals in fish worry me

 
 

People I eat with, do not like fish

 
 

Eating fish is expensive

 

Do you think it is easy or difficult to eat two servings of fruit each day/200 grams of vegetables each day/fish once or twice a week

Self-efficacy for fruit

In the weekends

.90

 

During working days

 
 

In winter

 
 

When you don't have much time

 
 

When you experience (emotional) distress

 
 

When having a touch of flu or a cold

 

Self-efficacy for vegetables

In the weekends

.85

 

During working days

 
 

In winter

 
 

When you don't have much time

 
 

When you experience (emotional) distress

 
 

When having a touch of flu or a cold

 

Self-efficacy for fish

When you don't have much time

.88

 

When there is a lot of choice in fish

 
 

When the people you eat with do not like fish

 
 

When you have to prepare the fish yourself

 
 

When there are still bones in the fish

 
 

When you do not eat at home, for example at a restaurant or by friends

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