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Trial registered on ANZCTR

Registration number
Ethics application status
Date submitted
Date registered
Date last updated
Date data sharing statement initially provided
Type of registration
Prospectively registered

Titles & IDs
Public title
The impact of work-time nutrition as a success factor for enterprises and their employees in Satakunta (RAVI-study)
Scientific title
The impact of work-time nutrition as a success factor for enterprises and their employees in Satakunta (RAVI-study)
Secondary ID [1] 309712 0
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Work ability 330095 0
Work well-being 330097 0
Work productivity 330098 0
Sickness absence 330099 0
Health-related quality of life 330100 0
Nutrient intake and food habits 330101 0
Condition category
Condition code
Diet and Nutrition 326987 326987 0 0
Other diet and nutrition disorders

Study type
Description of intervention(s) / exposure
Participants in the intervention group receive multifactorial and tailored nutritional guidance for 12 months including
1) tailored nutritional guidance 3-4 times
2) personal nutritional plan
3) opportunity to participate “Work well-being with nutrition” - online training
4) Eat@Work- mobile application to follow their own eating
5) use of smart watch to follow own physical activity and sleep
6) a comprehensive information package about own health

Tailored nutritional guidance is given during the 12-month intervention period 3-4 times face to face individually by the study nutritionist. One guidance session lasts for 1-2 hours, and it is given at the participant’s workplace if possible, or at the premises of Satakunta University of Applied Sciences. All nutritional guidance sessions are given by the same study nutritionist. Nutritional guidance is based on the results of participant’s nutritional status, nutrient intake and eating behaviour, background information, and the discussions with the participant and the nutritionist. Different booklets (from the The Association of Clinical and Public Health Nutritionists in Finland and from the Eat@Work project) about healthy nutrition are handed during the sessions. The motivational guidance method is used in the nutritional guidance.

All intervention group participants are provided a personal nutritional plan during the first nutritional guidance session, when the nutritionist and the participant discuss appropriate nutritional aims to improve eating habits. The nutritional guidance is based on the Finnish Nutrition and food recommendations (2014) and based on the new The Nordic Nutrition Recommendations (2022). The personal nutritional plan is reviewed and adjusted during the latter guidance sessions if needed. The adherence of the nutritional guidance and personal nutritional plan is measured with the GAS method, that allows the participant and the nutritionist to jointly define the achievement of goals of the nutritional guidance and plan on a five-step scale. Also, participants fill out a short feedback questionnaire in the last nutritional guidance session

The participants will take part in “Work well-being with nutrition” -online training” that has eight different modules which include different nutritional information about healthy eating and tasks for the participants. Each module opens every two weeks, so the overall duration of the online training is four months, and it is completed within the 12-month study period. Completing each module will take minimum of half an hour, but each module will include additional information for those interested. The training is created by nutritionists specifically to cover topics related to nutrition and well-being of working age participants. The online training is built in a Moodle learning platform provided by SAMK, where the participation and adherence is assessed by the percentage of assignments completed and feedback.

The Eat@Work- mobile application is instructed and encouraged to use (monthly, 15 minutes) during the intervention to strengthen the effects of the nutritional guidance. The Eat@Work mobile application includes nutritional information, tests, and videos to support changes in eating habits. Participants use the application to collect food records. At baseline and at final measurements participants take pictures of their foods and drinks for three days via the application. Participants send the food records (via application) to the study nutritionist, who analyzes the food records. The results are discussed in the nutritional guidance.

Participants in the intervention group use Polar® Ignite 2 fitness smart watches to follow their own physical activity, recovery, work vitality and sleep. The watch provides personalized guidance for workouts and sleep based on the collected data. The aim of the smart watch use is to support nutritional changes and to gather data to investigate the relationship between nutrition, activity/sleep and work-related outcomes.

Based on the information gathered at the baseline measurements, the intervention group volunteers will get a comprehensive package about their health and well-being, which is given in the first nutritional guidance (orally) sessions during the intervention study period. For example, if participant has a high risk for cardiovascular diseases, the nutritionist will give lifestyle advise to minimize the risk.
Intervention code [1] 326151 0
Intervention code [2] 326317 0
Treatment: Other
Comparator / control treatment
During the 12- months intervention period, control group is not provided with any treatment.

Control group

Primary outcome [1] 334843 0
Work ability is measured by using the Work Ability Index (WAI)
Timepoint [1] 334843 0
Baseline and 12 months post-intervention commencement
Primary outcome [2] 334844 0
Work well-being is measured using the Finnish Work Suction Test developed by the Finnish Institute of Occupational Health
Timepoint [2] 334844 0
Baseline and 12 months post-intervention commencement
Primary outcome [3] 334845 0
Health-related quality of life is assessed with EQ-5D-5L questionnaire
Timepoint [3] 334845 0
Baseline and 12 months post-intervention commencement
Secondary outcome [1] 422235 0
Nutrient intake and diet quality is assessed with 3-day food records
Timepoint [1] 422235 0
Baseline and 12 months post-intervention commencement
Secondary outcome [2] 422236 0
Food habits and eating behavior is measured with Food frequency questionnaire (FFQ)
Timepoint [2] 422236 0
Baseline and 12 months post-intervention commencement
Secondary outcome [3] 422237 0
Work productivity is measured with Work Productivity and Activity Impairment Questionnaire: General Health (WPAI-GH)
Timepoint [3] 422237 0
Baseline and 12 months post-intervention commencement
Secondary outcome [4] 422238 0
Sickness absence is measured with the 5th question of the Work Ability Index (WAI)
Timepoint [4] 422238 0
Baseline and 12 months post-intervention commencement
Secondary outcome [5] 422239 0
Sleep, activity, recovery and work vitality is measured with the Polar Ignite 2 smart watch (only for intervention group)
Timepoint [5] 422239 0
Data from the smart watches is gathered 1, 6, and 12 months post-intervention commencement

Key inclusion criteria
- has at least 12-month contract of employment in the recruited company
- ready to commit to either research group for a period of 12 months
- being able to read and understand Finnish well enough to give informed consent, to receive nutritional guidance and to use mobile app
- no clinically unstable diseases or conditions which could potentially be aggravated by the intervention
- having access to and being able to use a smartphone
- giving informed consent to participate in the study
Minimum age
18 Years
Maximum age
65 Years
Both males and females
Can healthy volunteers participate?
Key exclusion criteria
- do not have contracts to work during the study period
- medical illness that is clinically unstable or in terminal stage, and which could potentially be aggravated by the intervention
- severe eating disorder (e.g. anorexia, bulimia and binge-eating disorder)
- harmful use of alcohol (AUDIT-C)
- women who are pregnant
- is participating or has recently participated (approx. 5 years) in another nutrition intervention

Study design
Purpose of the study
Allocation to intervention
Randomised controlled trial
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Central randomisation by computer after baseline measurements, randomization is conducted by a person unrelated to the study
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Masking / blinding
Open (masking not used)
Who is / are masked / blinded?

Intervention assignment
Other design features
Not Applicable
Type of endpoint/s
Statistical methods / analysis
The sample size is calculated based on the expected change in the Work Ability Index (WAI) measuring work ability. Work ability is expected to change in the intervention group from 43 points to 44.5 points. The assumption is that work ability does not change in the control group. The calculation is based on estimated power of 0.8. The calculated sample size is 170, meaning 85 participants per group (ß 0.2, a 0.05). The sample size was estimated using Clincalc.

The results of the study is analyzed with IBM SPSS Statistics program and with STATA program. The normality of variables will be evaluated graphically and with the Shapiro-Wilk W test. Statistical comparisons between groups will be done using the analysis of independent samples t-test or Chi-square test, or Mann-Whitney U-test for nonparametric variables. The main outcome measures are subjected to analysis of covariance (ANCOVA).
The bootstrap method may be used when the theoretical distribution of the test statistics is
unknown or in the case of a violation of the assumptions (e.g. non-normality).
Hommel’s adjustment may be applied to correct levels of significance for multiple testing, if appropriate.

Recruitment status
Date of first participant enrolment
Date of last participant enrolment
Date of last data collection
Sample size
Accrual to date
Recruitment outside Australia
Country [1] 25552 0
State/province [1] 25552 0

Funding & Sponsors
Funding source category [1] 313905 0
Government body
Name [1] 313905 0
European Regional Development Fund/ Regional Council of Satakunta
Country [1] 313905 0
Funding source category [2] 313917 0
Name [2] 313917 0
Satakunta University of Applied Sciences
Country [2] 313917 0
Primary sponsor type
Satakunta University of Applied Sciences
Satakunnankatu 23
28101 Pori
Secondary sponsor category [1] 315778 0
Name [1] 315778 0
Address [1] 315778 0
Country [1] 315778 0

Ethics approval
Ethics application status
Ethics committee name [1] 313052 0
Ethics Committee of the wellbeing services county of Southwest Finland
Ethics committee address [1] 313052 0
Secretary of the Ethics Committee
The wellbeing services county of Southwest Finland
Tyks U-hospital
Kiinamyllynkatu 4-8
PO Box 52
FI-20521 Turku
Ethics committee country [1] 313052 0
Date submitted for ethics approval [1] 313052 0
Approval date [1] 313052 0
Ethics approval number [1] 313052 0

Brief summary
Workplaces are a fruitful environment to support workers' eating habits, since adults spend almost half of their waking hours at work. Regular eating and nutritious meals help to promote well-being at work and beyond. Supporting employee health and well-being with workplace health promotion programs focusing on dietary changes and healthy eating including personal and educational components, environmental components and multi-component strategies have been proven to be effective.

Recruiting new workforce in the more rural areas of Finland, such as Satakunta, has been found to be problematic. Coincidently there is not enough graduating young workforce, elder workers are retiring, and increasing numbers of health problems are affecting the share of Finnish working age population. To optimize the use of the existing workforce health promotion interventions focusing on nutrition have been suggested to better the health and well-being of the current working age Finns in Satakunta and beyond.

The RAVI trial is a randomized, controlled trial (RCT) exploring the effectiveness of personal nutritional guidance on work ability, work productivity, sickness absence, work well-being, health-related quality of life and nutrition. Participants are working-aged (= 18 years) employees (n=170) in six different companies located in Satakunta. The twelve-month intervention in the intervention group (IG) includes 3-4 times tailored nutritional guidance, personal nutritional plan, “Work well-being with nutrition” - online training, and smart watches to follow their own physical activity and sleep. Participants in the control group do not receive any nutritional guidance in the twelve-month study period, but after the final measurements they get one nutritional guidance session and access to online training.

The trial has comprehensive baseline and final measurements, that include an electronic questionnaire assessing work-related outcomes, background and lifestyle information, blood tests at the laboratory and a nurse’s appointment with blood pressure measuring. Measurements for work-related outcomes: Work ability and sickness absence is measured with the Work Ability Index (WAI), work well-being with WAI and the Suction of work-test, and Work productivity is measured with Work Productivity and Activity Impairment Questionnaire (WPAI:GH). In addition health-related quality of life is measured with EQ-5D-5L questionnaire, Dietary assessment is done using a Food Frequency Questionnaire and a 3-day food record. Food records are kept with Eat@Work mobile application. Only amongst the intervention group protein intake is tested with protein intake screener and sleep and activity are measured with smartwatch.

This study will provide nationally important data on how workplace nutrition guidance affects quality of life, work performance, sickness absence, eating behavior and dietary intake among working age Finns.
Trial website
Trial related presentations / publications
Public notes

Principal investigator
Name 126822 0
Dr Susanna Kunvik
Address 126822 0
SAMK, Satakunta University of Applied Sciences
Satakunnankatu 23,
28101 Pori
Country 126822 0
Phone 126822 0
Fax 126822 0
Email 126822 0
Contact person for public queries
Name 126823 0
Dr Susanna Kunvik
Address 126823 0
SAMK, Satakunta University of Applied Sciences
Satakunnankatu 23,
28101 Pori
Country 126823 0
Phone 126823 0
Fax 126823 0
Email 126823 0
Contact person for scientific queries
Name 126824 0
Dr Susanna Kunvik
Address 126824 0
SAMK, Satakunta University of Applied Sciences
Satakunnankatu 23,
28101 Pori
Country 126824 0
Phone 126824 0
Fax 126824 0
Email 126824 0

Data sharing statement
Will individual participant data (IPD) for this trial be available (including data dictionaries)?
No/undecided IPD sharing reason/comment
Sensitive data and complying with the Data Protection Act

What supporting documents are/will be available?

TypeCitationLinkEmailOther DetailsAttachment
Study protocol Not yet published
Clinical study report Not yet published

Results publications and other study-related documents

Documents added manually
No documents have been uploaded by study researchers.

Documents added automatically
No additional documents have been identified.