Promotion of fruit and vegetable consumption among low income groups using a pricing strategy

Promotion of fruit and vegetable consumption among low income groups using a pricing strategy: a randomized controlled trial

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN56596945

Enrollment

180

Registered

2011-12-19

Start date

2010-09-01

Completion date

Unknown

Last updated

2015-01-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Obesity, Healthy diet Nutritional, Metabolic, Endocrine Obesity

Interventions

The trial contained four research arms: 1. Price discounts on fruits and vegetables 2. Nutrition education with a special focus on fruits and vegetables 3. Price discounts on fruits and vegetables pl

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: 1. Adults (18 years or older) 2. Familiar with the Dutch language 3. Lower socio-economic status (based on education level and working status) 4. Regular shoppers at the participating supermarkets

Exclusion criteria

Exclusion criteria: Does not meet inclusion criteria

Design outcomes

Primary

Measure	Time frame
1. Purchases of fruit and vegetables (grams): measured at baseline, 1 month, 3 months, 6 months (end of intervention) and 9 months (3 month follow-up) using cash receipts and schemes listing purchased fruits and vegetables during a two-week period 2. Intake of fruit and vegetables (grams) measured at baseline, 1 month, 3 months, 6 months (end of intervention) and 9 months (3 month follow-up) using a validated shortened Food frequency questionnaire (FFQ) specifically developed for fruit and vegetable intake	—

Measure

Time frame

1. Purchases of fruit and vegetables (grams): measured at baseline, 1 month, 3 months, 6 months (end of intervention) and 9 months (3 month follow-up) using cash receipts and schemes listing purchased fruits and vegetables during a two-week period 2. Intake of fruit and vegetables (grams) measured at baseline, 1 month, 3 months, 6 months (end of intervention) and 9 months (3 month follow-up) using a validated shortened Food frequency questionnaire (FFQ) specifically developed for fruit and vegetable intake

—

Secondary

Measure	Time frame
1. The concepts of TBP (attitudes, social norm, and perceived behavioral control) were measured as proposed by Conner and Sparks (1996) 2. Behavioral intention and awareness of own consumption levels were measured in accordance with earlier studies (see Brug et al. 2006) 3. Levels of action planning and levels of coping planning were measured as proposed by Scharzer and Renner 4. Some additional concepts that previously have found to be of importance in food pricing studies were measured, being levels of habit strength (using scal of Verplanken) and price perception (using scale of Lichtenstein). Scores for all these concepts were measured by summing the scores of the relevant items and dividing this by the number of relevant items. All items were measured on a 5 point Likert scale 5. Finally, participants were asked to report some basic personal characteristics, their use of the discount coupons, their evaluation of the nutrition education, and frequency of shopping at the participating supermarket	—

Measure

Time frame

1. The concepts of TBP (attitudes, social norm, and perceived behavioral control) were measured as proposed by Conner and Sparks (1996) 2. Behavioral intention and awareness of own consumption levels were measured in accordance with earlier studies (see Brug et al. 2006) 3. Levels of action planning and levels of coping planning were measured as proposed by Scharzer and Renner 4. Some additional concepts that previously have found to be of importance in food pricing studies were measured, being levels of habit strength (using scal of Verplanken) and price perception (using scale of Lichtenstein). Scores for all these concepts were measured by summing the scores of the relevant items and dividing this by the number of relevant items. All items were measured on a 5 point Likert scale 5. Finally, participants were asked to report some basic personal characteristics, their use of the discount coupons, their evaluation of the nutrition education, and frequency of shopping at the participating supermarket

—

Countries

Netherlands

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Mar 24, 2026